Early Years and Initial Growth (1917–1960)

Henningson Engineering Company was founded in mid-1917 by Henning H. Henningson, a civil engineer, in Omaha, Nebraska, amid World War I.[4] The firm's initial emphasis was on designing infrastructure for rural Midwestern communities, particularly power and water treatment systems to support small towns adapting to urbanization and electrification needs.[2] Henningson's approach involved attending over 4,000 city council meetings across Nebraska, Iowa, Kansas, Missouri, and Colorado to understand local requirements.[2] The company's first contract, secured on July 21, 1917, was for a powerhouse in Ogallala, Nebraska.[4]

By late 1917, the firm had expanded operations into Iowa, Nebraska, Illinois, Colorado, South Dakota, Missouri, and Kansas, building a reputation for reliable engineering work.[4] In 1919, it relocated to the 302 National Building in Omaha and employed 12 engineers, each earning $125 per month.[4] Throughout the 1920s, Henningson Engineering designed hundreds of public works projects, including power plants, streets, sewers, and schools, primarily serving Midwestern municipalities.[4]

The Great Depression posed challenges, but the firm sustained operations through involvement in Rural Electrification Administration (REA) projects starting in the 1930s, particularly in Nebraska by 1936, which facilitated rural power infrastructure development.[16][4] Willard A. Richardson joined during this period, contributing electrical engineering expertise.[2] In 1940, Charles "Chuck" Durham came on board, followed in 1946 by Henningson granting each a one-third ownership interest, with himself as president, Durham as vice president, and Richardson as secretary-treasurer.[2] The company outgrew its Omaha office space three times between 1937 and 1953, reflecting steady expansion, and engineers used airplanes—piloted by former military personnel—for efficient regional client service.[2]

In 1950, the firm was officially renamed Henningson, Durham & Richardson, Inc. (HDR), marking a leadership transition with Durham as president and Richardson as vice president; Henningson retired in 1953 but remained influential until his death in 1958.[4] By 1957, HDR opened its first branch office in Colorado Springs, Colorado.[2] The architectural department expanded nationally during this era, exemplified by projects like the New Federal Building in Omaha, while the firm's engineering focus broadened to include international opportunities, such as a $50 million dam and irrigation project in southern Spain awarded in 1960.[4][2]

Expansion and Diversification (1960s–1990s)

During the 1960s, HDR expanded its service offerings beyond civil engineering by establishing a dedicated architecture department, which flourished with projects such as the New Federal Building in Omaha, Nebraska.[4] [11] The firm opened additional branch offices, including its first in Colorado Springs in 1957, and grew to approximately 200 employees with annual revenues of $3 million by the decade's end.[16] Internationally, HDR secured its first major overseas contract in 1960 for a $50 million dam and irrigation project in Spain's Guadarranque and Palmones River Valleys, followed by the establishment of an office in Madrid.[2]

In the 1970s, HDR achieved worldwide operational reach, opening project offices in Rome, Seoul, and expanding in Madrid, while diversifying into environmental services and judicial facilities design.[4] [16] Key acquisitions included Durham Anderson and Freed in Seattle in 1974 and Pfeifer and Shultz in Minneapolis in 1976, bolstering regional capabilities.[16] Notable projects encompassed the Guanabara Water Project in Rio de Janeiro, Brazil, underscoring the firm's growing expertise in large-scale water infrastructure.[4] [11]

The 1980s marked a pivotal ownership shift when French firm Bouygues S.A. acquired HDR in 1983 for $60 million, introducing design-build delivery methods and enhancing global perspectives.[4] [16] By the early 1980s, HDR operated 21 U.S. offices with 1,100 employees and added services in recycling, landfills, and materials recovery.[2] [11] Projects included the Fort Pitt Bridge in Pittsburgh and a $350 million segment of Boston's Central Artery Tunnel, though initiatives like Texas high-speed rail were ultimately abandoned.[4] [16]

By the mid-1990s, HDR had expanded to 60 offices and 1,600 employees, generating $300 million in annual revenues, before employees repurchased the firm from Bouygues in 1996 for approximately $55 million, reinstating an employee-ownership model.[16] [11] Further diversification occurred through organic growth and the 1999 acquisition of Ehrlich-Rominger, a California-based high-tech design firm adding 125 employees and expertise in specialized sectors.[16] The decade also saw entry into healthcare design, advanced water resources, transportation planning, power and energy, and deepened environmental consulting, with new offices such as in London to support healthcare privatization efforts.[16] [11]

Contemporary Era and Strategic Shifts (2000–Present)

In 2004, HDR completed the repurchase of its company stock two years ahead of schedule, achieving full employee ownership and reinforcing its governance model centered on employee incentives and long-term stability.[4] This shift built on the 1996 transition to broad-based employee ownership, with over 90% of global employees holding stock or equity by 2021.[2] The firm pursued aggressive organic growth alongside targeted acquisitions to diversify expertise in water resources, building engineering, and economic analysis, exemplified by the 2005 acquisition of HLB Decision Economics, which integrated economic modeling into infrastructure design processes.[17] Subsequent deals, such as the 2006 purchase of New York City-based Daniel Frankfurt P.C. for rail and transit engineering, and the 2011 acquisitions of HydroQual Inc. for water quality modeling and Amnis Engineering for Canadian water infrastructure, expanded technical capabilities in environmental and hydraulic sectors.[18][19]

Global expansion accelerated in the 2010s, with new offices established in 2010 across Australia, Canada, China, Germany, Mongolia, Qatar, and the UAE to support international projects like the Cleveland Clinic in Abu Dhabi.[4] Acquisitions furthered this reach, including mid-2010s entries into Australian markets via Rice Daubney Architects in Sydney and Salva in Brisbane for mining and resources, alongside the 2018 asset purchase of David Ford Consulting Engineers for advanced hydrology and flood risk tools, and the 2019 acquisition of London-based Hurley Palmer Flatt Group to bolster multidisciplinary building services in Europe.[11][20][21] By the 2020s, HDR had grown to over 13,000 employees across more than 200 offices worldwide, with annual revenues approaching $3 billion, reflecting sustained emphasis on integrated architecture, engineering, and environmental services.[2][11]

Strategic initiatives in the 2010s and 2020s shifted toward sustainability, resilience, and digital integration, including coastal flood protection, habitat conservation, and net-zero design practices amid client demands for regenerative infrastructure.[22][23] The establishment of the employee-funded HDR Foundation in 2012 formalized philanthropic efforts, culminating in a record $1.44 million in grants by 2022 to support community nonprofits.[4] Under new CEO John Henderson in 2024, the firm advanced its strategic plan focusing on innovation in federal transportation funding responses and resource-efficient solutions, while maintaining employee ownership as a core differentiator in talent retention and project delivery.[24][25]

Engineering Solutions

HDR's engineering solutions encompass multidisciplinary disciplines including civil, structural, mechanical, electrical, and coastal engineering, tailored to infrastructure and facility challenges. The firm emphasizes custom designs that integrate function, schedule, budget, constructability, safety, and sustainability, leveraging over a century of experience in systems such as water, sewer, roads, and electric infrastructure.[26]

In building engineering, HDR delivers mechanical systems focused on energy efficiency, incorporating life cycle cost analysis, energy studies, and commissioning support for central utility plants. Electrical engineering services include low- and medium-voltage power distribution, standby power, uninterruptible power supplies, short circuit analysis, and arc flash calculations, with designs that exceed energy codes for sustainability. Structural engineering provides innovative approaches to seismic design, building rehabilitation, and high-rise structures, prioritizing collaborative and cost-effective outcomes. Plumbing and specialty gases systems cover complex water distribution, compressed air, medical gases, and fire protection variants including wet, dry, pre-action, and foam systems.[27]

Coastal engineering capabilities draw on more than 60 years of experience in mitigation, restoration, and creation projects for beaches, bays, and estuaries, addressing erosion, flooding, severe weather, and sea level rise. Services include shoreline nourishment, dune restoration, habitat rehabilitation, and storm risk reduction using hard structures, artificial reefs, and nature-based solutions, supported by expertise in nearshore oceanography, marine geology, fisheries, and regulatory compliance. Instrumentation and controls integrate systems for optimized facility operations and energy efficiency, while building data management employs digital tools for accurate, accessible data to enhance construction productivity and reduce failure rates.[28][26][27]

Architectural and Design Services

HDR's architectural and design services encompass architectural design, interior design, building engineering, and landscape architecture, delivered through an integrated multidisciplinary practice.[29] These services focus on creating functional spaces for diverse applications, including community centers, laboratories, hospitals, and public infrastructure, with examples such as the Northside Community Centre in Australia, the University of Sydney Life & Earth Environmental Sciences building, and the Shirley Ryan AbilityLab in Chicago.[29][30][31][32]

The firm employs a participatory design process that emphasizes collaboration with stakeholders to minimize risks and reduce iteration cycles, integrating architectural efforts with engineering for enhanced efficiency and creativity.[29] This approach incorporates data-driven methodologies from early planning stages, utilizing advanced modeling, artificial intelligence, machine learning, and computational tools to optimize designs and generate actionable insights.[29][33] Technologies such as generative AI, predictive analytics, digital twins, and environmental modeling enable scenario testing, automation, and adaptive solutions across project phases, from strategic planning to execution.[33]

HDR advances regenerative design frameworks targeting reductions in carbon, water use, biodiversity impacts, and other metrics, aligning with identified megatrends like triple net-zero design (net-zero energy, water, and carbon in circular systems), place-based innovation for urban ecosystems, and hybrid intelligence via AI-enhanced processes.[29][34] Additional trends include social value integration with measurable impacts, flexibility for adaptable infrastructure, and equity-driven co-design for inclusive spaces, applied in projects such as the CNL Chalk River Laboratories and Sydney Biomedical Accelerator.[34][35][36] The firm's work has earned recognition, including over a dozen Fast Company World Changing Ideas awards for innovative architectural outcomes.[29]

Environmental and Construction Capabilities

HDR maintains extensive environmental capabilities through a team exceeding 1,000 professionals specializing in environmental planning, regulatory permitting, National Environmental Policy Act (NEPA) compliance, archaeology, historic preservation, biology, ecological restoration, wetland and stream ecology, fisheries science, toxicology, and marine species analysis.[37] These experts deliver services including environmental impact assessments, noise and vibration monitoring and modeling, GIS-integrated spatial analyses, data collection, computer-based simulations, and navigation of permitting requirements to address regulatory challenges and minimize ecological disruptions for public agencies and private clients.[37]

In sustainability and resilience, HDR's specialists focus on climatology, natural resource management, renewable energy integration, green building rating systems, commissioning, and measurement and verification processes to create resource-efficient designs that balance economic viability with environmental preservation.[22] The firm emphasizes resilient infrastructure adaptable to environmental changes, incorporating community-sensitive planning that preserves historic resources and enhances local assets, as demonstrated in projects like Atlanta's Historic Fourth Ward Park.[22] This interdisciplinary approach integrates sustainability practices established over two decades into broader engineering and architectural services for long-term project viability.[22]

HDR's construction capabilities are supported by 1,120 dedicated professionals in construction management, engineering, and inspection, who have delivered over 4,600 projects globally across 45 years.[38] The firm employs delivery methods such as design-bid-build, design-build, construction management at risk (CMAR), public-private partnerships, and integrated project delivery, providing on-site personnel for critical path scheduling, real-time cost estimation, web-based document control, and contract compliance to mitigate risks and optimize timelines.[39][38] Construction services incorporate environmental monitoring to ensure alignment with regulatory standards and integrate seamlessly with design phases, reflecting HDR's rankings as the 11th top program management firm and 16th top construction management-for-fee firm by Engineering News-Record.[38]

Transportation and Infrastructure

HDR specializes in transportation infrastructure engineering, offering end-to-end services including planning, design, construction management, and asset lifecycle support for highways, bridges, rail systems, transit, ports, and airports. The firm integrates intelligent transportation systems (ITS), smart mobility technologies, and sustainable practices such as electrification and autonomous vehicle readiness into its projects. Ranked fifth among transportation firms, second in bridges, and fifth in mass transit and rail by Engineering News-Record, HDR emphasizes alternative delivery methods like progressive design-build to mitigate risks and accelerate complex infrastructure delivery.[40][41][42]

Key highway and bridge projects demonstrate HDR's expertise in rehabilitation and expansion under operational constraints. The Bayonne Bridge Navigational Clearance Project, completed in 2019, involved raising the roadway 64 feet within the existing 1931 steel arch span to achieve 215 feet of clearance, enabling access for post-Panamax container ships while keeping the bridge open to traffic; HDR led design in partnership with the Port Authority of New York and New Jersey.[43][44] The Seward Highway Milepost 75-90 Road and Bridge Rehabilitation in Alaska addressed seismic vulnerabilities and erosion, earning a Grand Award from the American Council of Engineering Companies in 2024.[45] Project Neon in Las Vegas, a $1 billion-plus interstate reconfiguration, was named the top U.S. road project in 2019 by Roads & Bridges magazine for its innovative traffic management during construction.[46]

In rail and transit, HDR supports freight, commuter, and light rail initiatives. In August 2025, an HDR-led joint venture secured a contract from the Metropolitan Transportation Authority to convert a dormant New York City freight line into the Interborough Express light rail, spanning 14 miles across four boroughs to serve 800,000 daily riders without new right-of-way acquisition.[47][48] For the California High Desert Corridor, HDR was selected in June 2025 to provide engineering and design for a 167-mile high-speed intercity rail alignment connecting Los Angeles to Las Vegas and Victorville.[49] The firm's role in Austin's Project Connect encompasses planning two light rail corridors, four high-capacity bus routes, and an underground transit tunnel to expand regional mobility.[50] These efforts align with federal funding from the Infrastructure Investment and Jobs Act, prioritizing multimodal resilience and efficiency.[51]

Healthcare and Science Facilities

HDR designs and plans healthcare facilities with a focus on human-centered, evidence-based approaches that integrate clinical operations, patient experience, and operational efficiency. The firm has delivered hundreds of acute care projects, ranging from small community hospitals to large urban medical centers and academic health systems.[52] Notable examples include the Shirley Ryan AbilityLab, recognized as the first-ever translational research hospital combining patient care with on-site rehabilitation research.[53] Additional projects encompass the VCU Health Adult Outpatient Pavilion for expanded ambulatory services, the Clifton Center for Medical Breakthroughs emphasizing innovative diagnostics, and the UCSF Health Helen Diller Family Comprehensive Cancer Center, which prioritizes integrated oncology care.[54] HDR's healthcare work has earned top industry rankings, including No. 1 in healthcare design by Modern Healthcare's 2024 survey and Building Design+Construction's Giants rankings.[53]

In science and technology facilities, HDR specializes in high-performance laboratories supporting life sciences, physical sciences, and emerging fields like nanotechnology and cleanroom environments. The firm creates adaptable, sustainable research spaces that address challenges in health, energy, and environmental protection, often incorporating flexible lab modules and advanced containment systems.[55] They have secured 11 R&D Magazine Lab of the Year awards for projects demonstrating technical innovation and user-centric design.[55] A prominent example is the Argonne National Laboratory Energy Sciences Building in Lemont, Illinois, a 158,000-square-foot (14,680 m²) facility completed to LEED Gold standards, featuring open-plan labs, a central collaboration atrium, and efficient service corridors to enable interdisciplinary energy research.[56] Other contributions include the USAMRIID research facilities for biosafety-level containment and the CNL Science Collaboration Centre at Chalk River Laboratories, designed for nuclear science planning and sustainability.[55][57] HDR holds the No. 1 ranking in laboratory design from Building Design+Construction and No. 2 in science/technology facilities from the World Architecture 100 Survey.[55]

Justice and Correctional Facilities

HDR specializes in the design of justice and correctional facilities, incorporating restorative justice principles that prioritize treatment, wellness, and operational efficiency over punitive isolation. The firm emphasizes evidence-based environments that support mental health care, rehabilitation programs, and secure operations, influencing broader trends in detention design toward therapeutic models.[58][59]

Two of HDR's correctional health facilities have received exemplary recognition from the U.S. Department of Justice, highlighting the firm's role in elevating standards for inmate medical and mental health services within secure settings.[58] One notable project is the Illinois Department of Corrections In-Patient Treatment Center, featuring 150 mental health beds and 50 medical beds, designed with therapeutic elements such as natural light, communal spaces, and integrated care to address untreated conditions prevalent among inmates.[60] Construction on this facility advanced through phased bid packages to meet a 900-day design-build timeline, enabling early site work and comprehensive programming for chronic care, addiction treatment, and behavioral health.[60]

In June 2025, the Arkansas Board of Corrections approved a $57.1 million contract with HDR and local partner Cromwell Architects+Engineers for a new 3,000-bed state prison in Franklin County, aimed at alleviating overcrowding while incorporating housing units with enhanced safety features, dining access, and welfare-compliant standards.[61][62] The design focuses on direct supervision models to improve staff-inmate interactions and reduce violence, drawing on HDR's experience in scalable, wellness-oriented correctional architecture.[59]

To strengthen its justice practice, HDR recruited industry veterans Bob Glass and Larry Hlavacek on July 1, 2024, leveraging their expertise in innovative facility layouts that integrate security with rehabilitation, including specialized units for vulnerable populations.[63] Reports indicate HDR has designed over 275 jails, prisons, and detention centers across the United States, though such figures originate from advocacy critiques rather than firm disclosures.[64]

Water and Other Critical Sectors

HDR's water practice emphasizes an integrated "One Water" perspective, addressing interconnected challenges in water quantity, quality, equity, and resiliency through planning, design, and management of conveyance systems, drinking water treatment, wastewater processing, and resource restoration.[65][66] The firm has delivered projects enhancing supply reliability and treatment efficiency, including the $260 million Yadkin Regional Water Supply Project in North Carolina, which provides potable water to a projected 115,000 customers in the Yadkin River Basin and supports the Town of Norwood.[67] In wastewater, HDR manages advanced treatment programs such as the EchoWater initiative in Billings, Montana, involving nutrient upgrades, expansions, and sidestream treatment innovations to renew water resources.[68][69]

The firm also supports water system recovery in distressed urban areas, as demonstrated by its role in stabilizing Jackson, Mississippi's infrastructure through engineering assessments, strategic communications, and rehabilitation efforts following chronic supply disruptions.[70] HDR contributes to broader resource management by developing guidance tools, including a two-year One Water Program Management knowledge base initiated in October 2022, which offers foundational strategies for planning and delivering interconnected infrastructure programs across hydrologic cycles.[71] These efforts incorporate risk-based budgeting and condition assessments informed by industry standards like AWWA manuals to prioritize maintenance and rehabilitation.[72]

Beyond water, HDR engages in other critical infrastructure sectors such as power and defense. In power generation, transmission, and distribution, the firm provides program management and engineering to enhance reliability and resiliency, including mixed-resource strategies like combined heat and power, natural gas, and renewables for industrial facilities.[73][74] For defense and intelligence, HDR delivers sustainable solutions for mission-critical facilities, with over 50 years of experience in projects ranging from renovations to multi-million-dollar constructions, and has produced Installation Energy Plans and Climate Resiliency Plans for 36 U.S. Air Force installations to advance sustainability goals.[75][76] Asset management services span these sectors, optimizing buried pipelines, energy systems, and secure operations through data-driven analyses.[77]

Acquisition Strategy

HDR employs a targeted acquisition strategy focused on acquiring specialized engineering, architectural, and consulting firms to augment its technical expertise, broaden service offerings, and extend its global presence. This approach, initiated in the late 1990s, prioritizes firms with complementary capabilities in core markets such as transportation, water resources, and infrastructure, enabling HDR to integrate niche skills like economic analysis and hydrogeologic consulting into its multidisciplinary platform.[78] [11] By 2025, HDR had completed at least nine documented acquisitions spanning the United States, United Kingdom, and India, with industry analyses estimating over 60 transactions since 1996 to drive organic-like expansion without diluting its employee-owned structure.[79] [80]

The strategy emphasizes strategic fit over volume, selecting targets that enhance project delivery in high-demand sectors and facilitate cross-disciplinary synergies, such as combining infrastructure design with data-driven economic evaluation. For example, the 2021 acquisition of WRECO expanded HDR's multimodal transportation and water resources practices by incorporating advanced economic research tools, transforming traditional design workflows into more analytically robust processes.[81] [17] Similarly, the 2022 purchase of SPF Water Engineering added specialized wastewater and hydrogeologic expertise, directly supporting HDR's growth in environmental and critical infrastructure services.[82] [83]

Geographic diversification forms a core pillar, with acquisitions aimed at penetrating international markets while strengthening domestic operations. The 2019 acquisition of Hurley Palmer Flatt Group exemplifies this, providing HDR with established footholds in Europe, the Middle East, Africa, and Asia-Pacific to support its building engineering services amid global project demands.[84] Post-acquisition integration focuses on retaining talent and aligning operations under HDR's unified culture, overseen by leadership including Chief Strategy Officer Dave LeCureux, to minimize disruption and maximize value from expanded capabilities.[81] This disciplined method has enabled sustained scalability, with acquisitions typically involving private firms or employee-owned entities to preserve HDR's ownership model and long-term focus.[80]

Major Acquisitions and Integrations

In 2005, HDR acquired HLB Decision Economics, an economic research and consulting firm, integrating its expertise in cost-benefit analysis and risk assessment into HDR's engineering workflows to support data-driven infrastructure decisions.[85][17] This move enabled HDR to combine traditional design with objective economic modeling, enhancing project evaluations for public and private clients across sectors like transportation and utilities.

HDR expanded its international footprint with the June 2019 acquisition of Hurley Palmer Flatt Group, a London-headquartered engineering consultancy with over 300 employees specializing in building services, mechanical and electrical engineering, and data center design.[86][21] The integration strengthened HDR's multidisciplinary capabilities in commercial and mission-critical facilities, leading to the rebranding of Hurley Palmer Flatt as HDR in February 2022, which unified operations under a single global brand while retaining specialized teams.[87]

In June 2021, HDR acquired WKE, a Minnesota-based multimodal transportation engineering firm focused on rail, highway, and aviation projects, adding design, construction management, and program delivery expertise to deepen HDR's transportation portfolio.[88] Later that year, in September, HDR purchased WRECO, a California environmental consulting firm, incorporating 86 professionals skilled in habitat restoration and regulatory compliance to bolster water and environmental services.[81] These acquisitions were seamlessly integrated into HDR's employee-owned structure, expanding technical staff and geographic reach without disrupting ongoing projects.

HDR further targeted water infrastructure with the acquisition of Quest Engineers Inc., a Kentucky-based firm with 120 employees providing civil, structural, and electrical engineering for utilities, followed by SPF Water Engineering in April 2022, a Boise firm specializing in wastewater and hydrogeology.[89][90] Integrations emphasized cultural alignment with HDR's employee-ownership model, leveraging acquired talent for cross-market synergies in critical sectors like power and environmental management.

Outcomes and Expanded Capabilities

The acquisitions undertaken by HDR, Inc. have resulted in a marked broadening of its service portfolio, enabling the firm to deliver integrated solutions across diverse sectors including water management, transportation, and economic analysis integrated with engineering. By 2025, HDR had incorporated expertise from over 60 acquired entities since 1996, shifting from a primarily architecture and engineering-focused practice to a comprehensive provider encompassing planning, consulting, geospatial services, and construction management. This expansion has facilitated multidisciplinary project delivery, where economic modeling now informs infrastructure design, reducing risks and enhancing client value in public-sector investments.[11][85]

In the water sector, the February 2022 acquisition of SPF Water Engineering, a Boise, Idaho-based firm specializing in water, wastewater, and hydrogeologic consulting, strengthened HDR's capabilities in resource assessment and treatment infrastructure, allowing for end-to-end project handling from feasibility studies to regulatory compliance. Similarly, the acquisition of Quest Engineers Inc. extended HDR's civil engineering scope to include advanced water and wastewater project management across 12 service areas, improving operational efficiency in utility-scale developments. These integrations have positioned HDR to address complex environmental challenges, such as sustainable water supply systems amid increasing regulatory demands.[83][89]

Transportation services have similarly advanced through targeted buys, notably the June 2021 acquisition of WKE, a multimodal engineering firm, which added specialized design, construction management, and Northeast U.S. market depth, enabling HDR to manage larger-scale rail, highway, and transit projects with reduced silos between disciplines. The 2015 merger with CEI Architecture expanded HDR's Canadian operations, incorporating local architectural expertise for infrastructure and institutional facilities, thereby enhancing cross-border project execution in North America. In building engineering, the 2019 acquisition of Hurley Palmer Flatt Group in London augmented HDR's mechanical, electrical, and sustainability services for commercial and data center projects, fostering global standards compliance.[88][91][84]

A pivotal outcome has been the fusion of economic research with core engineering, exemplified by the early 2000s acquisition of HLB Decision Economics, which embedded quantitative forecasting into infrastructure planning; this has transformed HDR's approach to public funding decisions, yielding more resilient designs that account for long-term fiscal and demand variables. Collectively, these moves have elevated HDR's employee-owned model by distributing specialized talent across 200+ offices worldwide, boosting revenue through diversified revenue streams and competitive edges in integrated project delivery.[17][85]

Firm-Level Honors

HDR has been consistently recognized in industry rankings for its design and engineering prowess. In the 2025 Engineering News-Record (ENR) Top 500 Design Firms list, HDR ranked No. 6 overall among U.S.-based design firms and No. 3 among the Top 100 Pure Designers.[15] The firm also placed No. 5 in ENR's Top 20 Transportation design firms, No. 2 in Top 25 Bridges, and No. 5 in Top 25 Highways for 2024 rankings, reflecting sustained strength in infrastructure sectors.[3] Additionally, HDR ranked No. 6 in Consulting-Specifying Engineer's 2025 MEP Giants list, evaluating mechanical, electrical, and plumbing design revenue.[92]

As a 100% employee-owned firm, HDR has earned accolades for its ownership model and workplace culture. It ranked No. 6 on the National Center for Employee Ownership's 2023 Employee Ownership 100 list of America's largest majority employee-owned companies by revenue.[10] Forbes included HDR in its 2025 America's Best Large Employers list, based on employee surveys and company policies.[93] The firm has also been named a Top Workplace by various regional and national programs, including multiple certifications from Energage for employee satisfaction.[94]

Other firm-level honors include Canada's Top Employers for Young People in 2025, awarded by Mediacorp Canada Inc. for recruitment and retention initiatives targeting younger talent, marking the second consecutive year.[95] In the same year, HDR received Canada's Greenest Employers recognition from Mediacorp for sustainability programs.[3] The American Short Line and Regional Railroad Association granted HDR its 2025 Veterans Engagement Award for efforts supporting military veterans in the rail sector.[3] Earlier, the American Institute of Architects (AIA) Nebraska chapter named HDR Firm of the Year, citing its design excellence and regional impact.[96]

Project-Specific Accolades

HDR's projects have garnered recognition from industry bodies such as Engineering News-Record (ENR), the American Council of Engineering Companies (ACEC), and Fast Company for innovative design, sustainability, and execution. In 2025, the 30 Crossing highway improvement in New Jersey received ENR's Best Project Award in the Highway/Bridge category for its enhancements to traffic flow and safety along a critical corridor.[97] Similarly, the San Pedro Creek Culture Park in San Antonio earned a Merit Award in the Water/Wastewater category from ENR for transforming a buried creek into a public green space that mitigates flooding while providing recreational amenities.[97]

In transportation infrastructure, the I-90 Yellowstone Bridges replacement in Montana was awarded the Grand Project designation by ACEC's Montana chapter in 2025, acknowledging the engineering challenges overcome in reconstructing seismically resilient spans over the Yellowstone River.[98] The RiverFront Revitalization in Davenport, Iowa, secured ENR Midwest's Best Project Award in the Landscape/Urban Development category in 2024, as well as Fast Company's Innovation by Design Best Project Award in Urban Design, for redeveloping 60 acres of riverfront into mixed-use spaces emphasizing connectivity and environmental restoration.[99]

Healthcare and science facilities have also been honored; the Riverside Mental Health & Recovery Center in California received Fast Company's 2024 Innovation by Design Award for its psychiatric emergency services design, which integrates therapeutic environments to reduce patient agitation and staff stress. In water infrastructure, the Orange County Sanitation District Headquarters Complex was named a finalist in the 2025 World Architecture Festival and earned Fast Company's 2025 Innovation by Design recognition, alongside the 2024 Sustainable Project of the Year from USGBC California for its net-zero energy features and water recycling innovations.[100][101] These awards highlight HDR's contributions to project outcomes verified by peer-reviewed industry evaluations, though selections often reflect subjective criteria like innovation alongside measurable metrics such as cost savings and environmental impact.

Correctional Facility Designs

HDR, Inc. has designed over 275 jails and prisons across the United States, emphasizing evidence-based features such as natural light, rehabilitative programming spaces, and integrated mental health treatment to support security, staff wellness, and reduced recidivism.[102][58] The firm has developed two of the three correctional health facilities recognized by the U.S. Department of Justice as exemplary models, incorporating biophilic design principles and specialized care for inmate populations with untreated medical and mental health conditions.[58] Specific projects include the Illinois Department of Corrections In-Patient Treatment Center, providing 150 mental health beds and 50 medical beds on the Joliet campus, and the California Health Care Facility, focused on quality care within secure settings.[60][103]

Criticism of HDR's correctional designs primarily originates from prison abolitionist groups and formerly incarcerated individuals, who argue that no amount of redesign—such as "feminist" or gender-responsive facilities—can mitigate the inherent harms of incarceration, including family separation and sexual violence.[104][64] These activists have organized protests, including demonstrations outside HDR's Chicago office during the 2022 American Institute of Architects conference and weekly actions in Boston in 2021, demanding the firm withdraw from all carceral projects.[104] Such opposition has contributed to project delays, such as the 2021 pause of an $80 million women's jail in Travis County, Texas, following grassroots pressure on county commissioners.[104][102] Broader concerns, raised in investigative reporting, highlight how firms like HDR conduct needs assessments justifying jail expansions—often citing overcrowding and safety data—before securing design contracts, potentially influencing local policy toward larger facilities.[105]

Additional controversy surrounds HDR's monitoring of project opponents, including those resisting jail constructions, through its STRATA division, which analyzes public social media data to map dissent and inform client strategies.[102][106] This practice, applied to initiatives like a Greene County, Ohio, jail expansion, drew accusations of "corporate counterinsurgency" from activist groups, leading to HDR losing the design contract there despite eventual voter approval of the project.[105] A related 2021 class-action lawsuit, Davis v. HDR, Inc., alleged unlawful wiretapping of private Facebook groups monitoring opposition to infrastructure projects (including jails), but the case was dismissed in 2023 after courts ruled the groups lacked sufficient privacy protections.[107] HDR has defended these efforts as standard industry practices for community engagement, using public data to amplify voices and address concerns in public processes.[106]

Monitoring and Risk Assessment Practices

HDR, Inc. has implemented monitoring and risk assessment services to identify and mitigate potential opposition to its infrastructure projects, including correctional facilities. These practices involve analyzing social media activity, public records, and activist communications to map networks of resistance, which the firm describes as a proactive measure to manage "social license" risks. In internal documents obtained by investigative reports, HDR outlined its approach to leveraging large datasets for visualizing opposition dynamics, enabling clients such as government agencies to anticipate delays or cost overruns from protests.[102][108]

The firm's monitoring extended to both public and private online groups, prompting accusations of unethical surveillance. For instance, in projects involving jail expansions, HDR tracked Facebook groups opposing constructions in locations like Massachusetts and Connecticut, including efforts to assess activist strategies against proposed prisons. Critics, including prison abolition organizations, have labeled these tactics as a "corporate counterinsurgency," arguing they infringe on free speech and privacy by infiltrating or observing non-public discussions without consent. A 2021 class-action lawsuit, Davis v. HDR, Inc., alleged that HDR unlawfully monitored private communications of individuals opposing a highway project, claiming violations of privacy laws through unauthorized data collection.[102][107][109]

HDR defended its practices as standard industry risk management, emphasizing that monitoring relies on publicly available information and aims to protect project viability rather than suppress dissent. Company statements highlighted that unaddressed controversy can lead to financial losses, with one internal rationale noting, "Controversy is costly, both in reputation and in dollars. Social and political risk can delay or derail projects." The firm clarified it does not engage in illegal activities, such as hacking, and ceased certain monitoring after public scrutiny in 2021. However, advocacy groups like Building Up People Not Prisons continued to criticize HDR for prioritizing client interests over community concerns, particularly in correctional projects where opposition often stems from broader debates on incarceration policies.[106][108][64]

These risk assessment methods have not been independently audited for efficacy or ethics in peer-reviewed studies, though similar corporate monitoring tools are used by other engineering firms facing public pushback. While HDR's approach has arguably streamlined some project deliveries by preempting disruptions, it has fueled distrust among activists and led to calls for greater transparency in how firms like HDR evaluate socio-political risks.[106]

Legal and Public Backlash

In November 2021, Phoenix resident Carol Davis filed a class action lawsuit against HDR, Inc., alleging the firm violated the Federal Wiretap Act and Stored Communications Act by monitoring and collecting electronic communications from private Facebook groups opposing a highway construction project in Arizona.[109][110] The complaint claimed HDR deployed tools to access non-public group content without consent, purportedly to assess project risks for clients.[107] In March 2023, a federal court granted HDR's motion for summary judgment, dismissing the nationwide class action in a ruling described as a case of first impression under the Electronic Communications Privacy Act, finding no unlawful interception occurred.[111]

Public criticism intensified following 2021 reports that HDR's risk monitoring practices extended to tracking social media activity of activists opposing correctional facility projects, including jail expansions for government clients such as Greene County, Missouri.[102][112] Advocacy groups accused the firm of conducting "corporate counterinsurgency" by compiling weekly reports on "potential risks, influencers, and social networks" related to prison opponents, prompting HDR to defend the activities as standard public stakeholder analysis to mitigate controversy costs, not private surveillance.[106] Abolitionist organizations and formerly incarcerated individuals launched campaigns urging HDR to abandon correctional design contracts entirely, citing ethical concerns over profiting from incarceration infrastructure.[64]

Protests against HDR's prison-related work occurred outside its Chicago office in June 2022, where demonstrators, including architects and impacted community members, demanded the firm halt involvement in what they termed "feminist" or rehabilitative jail designs, arguing such projects perpetuate systemic harm despite purported humane features.[104] Separately, in November 2023, a Douglas County, Nebraska jury awarded $3.85 million to former HDR vice president Amy McAuliffe in a sex discrimination verdict, finding the firm liable for terminating her the day after she reported a colleague's conflict of interest, which she alleged was retaliatory and tied to gender bias.[113] In September 2025, HDR faced a $40 million negligence and breach-of-contract lawsuit from London Health Sciences Centre over defective window installations in a hospital renovation, highlighting ongoing project liability risks.[114]

Early Years and Initial Growth (1917–1960)

Henningson Engineering Company was founded in mid-1917 by Henning H. Henningson, a civil engineer, in Omaha, Nebraska, amid World War I.[4] The firm's initial emphasis was on designing infrastructure for rural Midwestern communities, particularly power and water treatment systems to support small towns adapting to urbanization and electrification needs.[2] Henningson's approach involved attending over 4,000 city council meetings across Nebraska, Iowa, Kansas, Missouri, and Colorado to understand local requirements.[2] The company's first contract, secured on July 21, 1917, was for a powerhouse in Ogallala, Nebraska.[4]

By late 1917, the firm had expanded operations into Iowa, Nebraska, Illinois, Colorado, South Dakota, Missouri, and Kansas, building a reputation for reliable engineering work.[4] In 1919, it relocated to the 302 National Building in Omaha and employed 12 engineers, each earning $125 per month.[4] Throughout the 1920s, Henningson Engineering designed hundreds of public works projects, including power plants, streets, sewers, and schools, primarily serving Midwestern municipalities.[4]

The Great Depression posed challenges, but the firm sustained operations through involvement in Rural Electrification Administration (REA) projects starting in the 1930s, particularly in Nebraska by 1936, which facilitated rural power infrastructure development.[16][4] Willard A. Richardson joined during this period, contributing electrical engineering expertise.[2] In 1940, Charles "Chuck" Durham came on board, followed in 1946 by Henningson granting each a one-third ownership interest, with himself as president, Durham as vice president, and Richardson as secretary-treasurer.[2] The company outgrew its Omaha office space three times between 1937 and 1953, reflecting steady expansion, and engineers used airplanes—piloted by former military personnel—for efficient regional client service.[2]

In 1950, the firm was officially renamed Henningson, Durham & Richardson, Inc. (HDR), marking a leadership transition with Durham as president and Richardson as vice president; Henningson retired in 1953 but remained influential until his death in 1958.[4] By 1957, HDR opened its first branch office in Colorado Springs, Colorado.[2] The architectural department expanded nationally during this era, exemplified by projects like the New Federal Building in Omaha, while the firm's engineering focus broadened to include international opportunities, such as a $50 million dam and irrigation project in southern Spain awarded in 1960.[4][2]

Expansion and Diversification (1960s–1990s)

During the 1960s, HDR expanded its service offerings beyond civil engineering by establishing a dedicated architecture department, which flourished with projects such as the New Federal Building in Omaha, Nebraska.[4] [11] The firm opened additional branch offices, including its first in Colorado Springs in 1957, and grew to approximately 200 employees with annual revenues of $3 million by the decade's end.[16] Internationally, HDR secured its first major overseas contract in 1960 for a $50 million dam and irrigation project in Spain's Guadarranque and Palmones River Valleys, followed by the establishment of an office in Madrid.[2]

In the 1970s, HDR achieved worldwide operational reach, opening project offices in Rome, Seoul, and expanding in Madrid, while diversifying into environmental services and judicial facilities design.[4] [16] Key acquisitions included Durham Anderson and Freed in Seattle in 1974 and Pfeifer and Shultz in Minneapolis in 1976, bolstering regional capabilities.[16] Notable projects encompassed the Guanabara Water Project in Rio de Janeiro, Brazil, underscoring the firm's growing expertise in large-scale water infrastructure.[4] [11]

The 1980s marked a pivotal ownership shift when French firm Bouygues S.A. acquired HDR in 1983 for $60 million, introducing design-build delivery methods and enhancing global perspectives.[4] [16] By the early 1980s, HDR operated 21 U.S. offices with 1,100 employees and added services in recycling, landfills, and materials recovery.[2] [11] Projects included the Fort Pitt Bridge in Pittsburgh and a $350 million segment of Boston's Central Artery Tunnel, though initiatives like Texas high-speed rail were ultimately abandoned.[4] [16]

By the mid-1990s, HDR had expanded to 60 offices and 1,600 employees, generating $300 million in annual revenues, before employees repurchased the firm from Bouygues in 1996 for approximately $55 million, reinstating an employee-ownership model.[16] [11] Further diversification occurred through organic growth and the 1999 acquisition of Ehrlich-Rominger, a California-based high-tech design firm adding 125 employees and expertise in specialized sectors.[16] The decade also saw entry into healthcare design, advanced water resources, transportation planning, power and energy, and deepened environmental consulting, with new offices such as in London to support healthcare privatization efforts.[16] [11]

Contemporary Era and Strategic Shifts (2000–Present)

In 2004, HDR completed the repurchase of its company stock two years ahead of schedule, achieving full employee ownership and reinforcing its governance model centered on employee incentives and long-term stability.[4] This shift built on the 1996 transition to broad-based employee ownership, with over 90% of global employees holding stock or equity by 2021.[2] The firm pursued aggressive organic growth alongside targeted acquisitions to diversify expertise in water resources, building engineering, and economic analysis, exemplified by the 2005 acquisition of HLB Decision Economics, which integrated economic modeling into infrastructure design processes.[17] Subsequent deals, such as the 2006 purchase of New York City-based Daniel Frankfurt P.C. for rail and transit engineering, and the 2011 acquisitions of HydroQual Inc. for water quality modeling and Amnis Engineering for Canadian water infrastructure, expanded technical capabilities in environmental and hydraulic sectors.[18][19]

Global expansion accelerated in the 2010s, with new offices established in 2010 across Australia, Canada, China, Germany, Mongolia, Qatar, and the UAE to support international projects like the Cleveland Clinic in Abu Dhabi.[4] Acquisitions furthered this reach, including mid-2010s entries into Australian markets via Rice Daubney Architects in Sydney and Salva in Brisbane for mining and resources, alongside the 2018 asset purchase of David Ford Consulting Engineers for advanced hydrology and flood risk tools, and the 2019 acquisition of London-based Hurley Palmer Flatt Group to bolster multidisciplinary building services in Europe.[11][20][21] By the 2020s, HDR had grown to over 13,000 employees across more than 200 offices worldwide, with annual revenues approaching $3 billion, reflecting sustained emphasis on integrated architecture, engineering, and environmental services.[2][11]

Strategic initiatives in the 2010s and 2020s shifted toward sustainability, resilience, and digital integration, including coastal flood protection, habitat conservation, and net-zero design practices amid client demands for regenerative infrastructure.[22][23] The establishment of the employee-funded HDR Foundation in 2012 formalized philanthropic efforts, culminating in a record $1.44 million in grants by 2022 to support community nonprofits.[4] Under new CEO John Henderson in 2024, the firm advanced its strategic plan focusing on innovation in federal transportation funding responses and resource-efficient solutions, while maintaining employee ownership as a core differentiator in talent retention and project delivery.[24][25]

Engineering Solutions

HDR's engineering solutions encompass multidisciplinary disciplines including civil, structural, mechanical, electrical, and coastal engineering, tailored to infrastructure and facility challenges. The firm emphasizes custom designs that integrate function, schedule, budget, constructability, safety, and sustainability, leveraging over a century of experience in systems such as water, sewer, roads, and electric infrastructure.[26]

In building engineering, HDR delivers mechanical systems focused on energy efficiency, incorporating life cycle cost analysis, energy studies, and commissioning support for central utility plants. Electrical engineering services include low- and medium-voltage power distribution, standby power, uninterruptible power supplies, short circuit analysis, and arc flash calculations, with designs that exceed energy codes for sustainability. Structural engineering provides innovative approaches to seismic design, building rehabilitation, and high-rise structures, prioritizing collaborative and cost-effective outcomes. Plumbing and specialty gases systems cover complex water distribution, compressed air, medical gases, and fire protection variants including wet, dry, pre-action, and foam systems.[27]

Coastal engineering capabilities draw on more than 60 years of experience in mitigation, restoration, and creation projects for beaches, bays, and estuaries, addressing erosion, flooding, severe weather, and sea level rise. Services include shoreline nourishment, dune restoration, habitat rehabilitation, and storm risk reduction using hard structures, artificial reefs, and nature-based solutions, supported by expertise in nearshore oceanography, marine geology, fisheries, and regulatory compliance. Instrumentation and controls integrate systems for optimized facility operations and energy efficiency, while building data management employs digital tools for accurate, accessible data to enhance construction productivity and reduce failure rates.[28][26][27]

Architectural and Design Services

HDR's architectural and design services encompass architectural design, interior design, building engineering, and landscape architecture, delivered through an integrated multidisciplinary practice.[29] These services focus on creating functional spaces for diverse applications, including community centers, laboratories, hospitals, and public infrastructure, with examples such as the Northside Community Centre in Australia, the University of Sydney Life & Earth Environmental Sciences building, and the Shirley Ryan AbilityLab in Chicago.[29][30][31][32]

The firm employs a participatory design process that emphasizes collaboration with stakeholders to minimize risks and reduce iteration cycles, integrating architectural efforts with engineering for enhanced efficiency and creativity.[29] This approach incorporates data-driven methodologies from early planning stages, utilizing advanced modeling, artificial intelligence, machine learning, and computational tools to optimize designs and generate actionable insights.[29][33] Technologies such as generative AI, predictive analytics, digital twins, and environmental modeling enable scenario testing, automation, and adaptive solutions across project phases, from strategic planning to execution.[33]

HDR advances regenerative design frameworks targeting reductions in carbon, water use, biodiversity impacts, and other metrics, aligning with identified megatrends like triple net-zero design (net-zero energy, water, and carbon in circular systems), place-based innovation for urban ecosystems, and hybrid intelligence via AI-enhanced processes.[29][34] Additional trends include social value integration with measurable impacts, flexibility for adaptable infrastructure, and equity-driven co-design for inclusive spaces, applied in projects such as the CNL Chalk River Laboratories and Sydney Biomedical Accelerator.[34][35][36] The firm's work has earned recognition, including over a dozen Fast Company World Changing Ideas awards for innovative architectural outcomes.[29]

Environmental and Construction Capabilities

HDR maintains extensive environmental capabilities through a team exceeding 1,000 professionals specializing in environmental planning, regulatory permitting, National Environmental Policy Act (NEPA) compliance, archaeology, historic preservation, biology, ecological restoration, wetland and stream ecology, fisheries science, toxicology, and marine species analysis.[37] These experts deliver services including environmental impact assessments, noise and vibration monitoring and modeling, GIS-integrated spatial analyses, data collection, computer-based simulations, and navigation of permitting requirements to address regulatory challenges and minimize ecological disruptions for public agencies and private clients.[37]

In sustainability and resilience, HDR's specialists focus on climatology, natural resource management, renewable energy integration, green building rating systems, commissioning, and measurement and verification processes to create resource-efficient designs that balance economic viability with environmental preservation.[22] The firm emphasizes resilient infrastructure adaptable to environmental changes, incorporating community-sensitive planning that preserves historic resources and enhances local assets, as demonstrated in projects like Atlanta's Historic Fourth Ward Park.[22] This interdisciplinary approach integrates sustainability practices established over two decades into broader engineering and architectural services for long-term project viability.[22]

HDR's construction capabilities are supported by 1,120 dedicated professionals in construction management, engineering, and inspection, who have delivered over 4,600 projects globally across 45 years.[38] The firm employs delivery methods such as design-bid-build, design-build, construction management at risk (CMAR), public-private partnerships, and integrated project delivery, providing on-site personnel for critical path scheduling, real-time cost estimation, web-based document control, and contract compliance to mitigate risks and optimize timelines.[39][38] Construction services incorporate environmental monitoring to ensure alignment with regulatory standards and integrate seamlessly with design phases, reflecting HDR's rankings as the 11th top program management firm and 16th top construction management-for-fee firm by Engineering News-Record.[38]

Transportation and Infrastructure

HDR specializes in transportation infrastructure engineering, offering end-to-end services including planning, design, construction management, and asset lifecycle support for highways, bridges, rail systems, transit, ports, and airports. The firm integrates intelligent transportation systems (ITS), smart mobility technologies, and sustainable practices such as electrification and autonomous vehicle readiness into its projects. Ranked fifth among transportation firms, second in bridges, and fifth in mass transit and rail by Engineering News-Record, HDR emphasizes alternative delivery methods like progressive design-build to mitigate risks and accelerate complex infrastructure delivery.[40][41][42]

Key highway and bridge projects demonstrate HDR's expertise in rehabilitation and expansion under operational constraints. The Bayonne Bridge Navigational Clearance Project, completed in 2019, involved raising the roadway 64 feet within the existing 1931 steel arch span to achieve 215 feet of clearance, enabling access for post-Panamax container ships while keeping the bridge open to traffic; HDR led design in partnership with the Port Authority of New York and New Jersey.[43][44] The Seward Highway Milepost 75-90 Road and Bridge Rehabilitation in Alaska addressed seismic vulnerabilities and erosion, earning a Grand Award from the American Council of Engineering Companies in 2024.[45] Project Neon in Las Vegas, a $1 billion-plus interstate reconfiguration, was named the top U.S. road project in 2019 by Roads & Bridges magazine for its innovative traffic management during construction.[46]

In rail and transit, HDR supports freight, commuter, and light rail initiatives. In August 2025, an HDR-led joint venture secured a contract from the Metropolitan Transportation Authority to convert a dormant New York City freight line into the Interborough Express light rail, spanning 14 miles across four boroughs to serve 800,000 daily riders without new right-of-way acquisition.[47][48] For the California High Desert Corridor, HDR was selected in June 2025 to provide engineering and design for a 167-mile high-speed intercity rail alignment connecting Los Angeles to Las Vegas and Victorville.[49] The firm's role in Austin's Project Connect encompasses planning two light rail corridors, four high-capacity bus routes, and an underground transit tunnel to expand regional mobility.[50] These efforts align with federal funding from the Infrastructure Investment and Jobs Act, prioritizing multimodal resilience and efficiency.[51]

Healthcare and Science Facilities

HDR designs and plans healthcare facilities with a focus on human-centered, evidence-based approaches that integrate clinical operations, patient experience, and operational efficiency. The firm has delivered hundreds of acute care projects, ranging from small community hospitals to large urban medical centers and academic health systems.[52] Notable examples include the Shirley Ryan AbilityLab, recognized as the first-ever translational research hospital combining patient care with on-site rehabilitation research.[53] Additional projects encompass the VCU Health Adult Outpatient Pavilion for expanded ambulatory services, the Clifton Center for Medical Breakthroughs emphasizing innovative diagnostics, and the UCSF Health Helen Diller Family Comprehensive Cancer Center, which prioritizes integrated oncology care.[54] HDR's healthcare work has earned top industry rankings, including No. 1 in healthcare design by Modern Healthcare's 2024 survey and Building Design+Construction's Giants rankings.[53]

In science and technology facilities, HDR specializes in high-performance laboratories supporting life sciences, physical sciences, and emerging fields like nanotechnology and cleanroom environments. The firm creates adaptable, sustainable research spaces that address challenges in health, energy, and environmental protection, often incorporating flexible lab modules and advanced containment systems.[55] They have secured 11 R&D Magazine Lab of the Year awards for projects demonstrating technical innovation and user-centric design.[55] A prominent example is the Argonne National Laboratory Energy Sciences Building in Lemont, Illinois, a 158,000-square-foot (14,680 m²) facility completed to LEED Gold standards, featuring open-plan labs, a central collaboration atrium, and efficient service corridors to enable interdisciplinary energy research.[56] Other contributions include the USAMRIID research facilities for biosafety-level containment and the CNL Science Collaboration Centre at Chalk River Laboratories, designed for nuclear science planning and sustainability.[55][57] HDR holds the No. 1 ranking in laboratory design from Building Design+Construction and No. 2 in science/technology facilities from the World Architecture 100 Survey.[55]

Justice and Correctional Facilities

HDR specializes in the design of justice and correctional facilities, incorporating restorative justice principles that prioritize treatment, wellness, and operational efficiency over punitive isolation. The firm emphasizes evidence-based environments that support mental health care, rehabilitation programs, and secure operations, influencing broader trends in detention design toward therapeutic models.[58][59]

Two of HDR's correctional health facilities have received exemplary recognition from the U.S. Department of Justice, highlighting the firm's role in elevating standards for inmate medical and mental health services within secure settings.[58] One notable project is the Illinois Department of Corrections In-Patient Treatment Center, featuring 150 mental health beds and 50 medical beds, designed with therapeutic elements such as natural light, communal spaces, and integrated care to address untreated conditions prevalent among inmates.[60] Construction on this facility advanced through phased bid packages to meet a 900-day design-build timeline, enabling early site work and comprehensive programming for chronic care, addiction treatment, and behavioral health.[60]

In June 2025, the Arkansas Board of Corrections approved a $57.1 million contract with HDR and local partner Cromwell Architects+Engineers for a new 3,000-bed state prison in Franklin County, aimed at alleviating overcrowding while incorporating housing units with enhanced safety features, dining access, and welfare-compliant standards.[61][62] The design focuses on direct supervision models to improve staff-inmate interactions and reduce violence, drawing on HDR's experience in scalable, wellness-oriented correctional architecture.[59]

To strengthen its justice practice, HDR recruited industry veterans Bob Glass and Larry Hlavacek on July 1, 2024, leveraging their expertise in innovative facility layouts that integrate security with rehabilitation, including specialized units for vulnerable populations.[63] Reports indicate HDR has designed over 275 jails, prisons, and detention centers across the United States, though such figures originate from advocacy critiques rather than firm disclosures.[64]

Water and Other Critical Sectors

HDR's water practice emphasizes an integrated "One Water" perspective, addressing interconnected challenges in water quantity, quality, equity, and resiliency through planning, design, and management of conveyance systems, drinking water treatment, wastewater processing, and resource restoration.[65][66] The firm has delivered projects enhancing supply reliability and treatment efficiency, including the $260 million Yadkin Regional Water Supply Project in North Carolina, which provides potable water to a projected 115,000 customers in the Yadkin River Basin and supports the Town of Norwood.[67] In wastewater, HDR manages advanced treatment programs such as the EchoWater initiative in Billings, Montana, involving nutrient upgrades, expansions, and sidestream treatment innovations to renew water resources.[68][69]

The firm also supports water system recovery in distressed urban areas, as demonstrated by its role in stabilizing Jackson, Mississippi's infrastructure through engineering assessments, strategic communications, and rehabilitation efforts following chronic supply disruptions.[70] HDR contributes to broader resource management by developing guidance tools, including a two-year One Water Program Management knowledge base initiated in October 2022, which offers foundational strategies for planning and delivering interconnected infrastructure programs across hydrologic cycles.[71] These efforts incorporate risk-based budgeting and condition assessments informed by industry standards like AWWA manuals to prioritize maintenance and rehabilitation.[72]

Beyond water, HDR engages in other critical infrastructure sectors such as power and defense. In power generation, transmission, and distribution, the firm provides program management and engineering to enhance reliability and resiliency, including mixed-resource strategies like combined heat and power, natural gas, and renewables for industrial facilities.[73][74] For defense and intelligence, HDR delivers sustainable solutions for mission-critical facilities, with over 50 years of experience in projects ranging from renovations to multi-million-dollar constructions, and has produced Installation Energy Plans and Climate Resiliency Plans for 36 U.S. Air Force installations to advance sustainability goals.[75][76] Asset management services span these sectors, optimizing buried pipelines, energy systems, and secure operations through data-driven analyses.[77]

Acquisition Strategy

HDR employs a targeted acquisition strategy focused on acquiring specialized engineering, architectural, and consulting firms to augment its technical expertise, broaden service offerings, and extend its global presence. This approach, initiated in the late 1990s, prioritizes firms with complementary capabilities in core markets such as transportation, water resources, and infrastructure, enabling HDR to integrate niche skills like economic analysis and hydrogeologic consulting into its multidisciplinary platform.[78] [11] By 2025, HDR had completed at least nine documented acquisitions spanning the United States, United Kingdom, and India, with industry analyses estimating over 60 transactions since 1996 to drive organic-like expansion without diluting its employee-owned structure.[79] [80]

The strategy emphasizes strategic fit over volume, selecting targets that enhance project delivery in high-demand sectors and facilitate cross-disciplinary synergies, such as combining infrastructure design with data-driven economic evaluation. For example, the 2021 acquisition of WRECO expanded HDR's multimodal transportation and water resources practices by incorporating advanced economic research tools, transforming traditional design workflows into more analytically robust processes.[81] [17] Similarly, the 2022 purchase of SPF Water Engineering added specialized wastewater and hydrogeologic expertise, directly supporting HDR's growth in environmental and critical infrastructure services.[82] [83]

Geographic diversification forms a core pillar, with acquisitions aimed at penetrating international markets while strengthening domestic operations. The 2019 acquisition of Hurley Palmer Flatt Group exemplifies this, providing HDR with established footholds in Europe, the Middle East, Africa, and Asia-Pacific to support its building engineering services amid global project demands.[84] Post-acquisition integration focuses on retaining talent and aligning operations under HDR's unified culture, overseen by leadership including Chief Strategy Officer Dave LeCureux, to minimize disruption and maximize value from expanded capabilities.[81] This disciplined method has enabled sustained scalability, with acquisitions typically involving private firms or employee-owned entities to preserve HDR's ownership model and long-term focus.[80]

Major Acquisitions and Integrations

In 2005, HDR acquired HLB Decision Economics, an economic research and consulting firm, integrating its expertise in cost-benefit analysis and risk assessment into HDR's engineering workflows to support data-driven infrastructure decisions.[85][17] This move enabled HDR to combine traditional design with objective economic modeling, enhancing project evaluations for public and private clients across sectors like transportation and utilities.

HDR expanded its international footprint with the June 2019 acquisition of Hurley Palmer Flatt Group, a London-headquartered engineering consultancy with over 300 employees specializing in building services, mechanical and electrical engineering, and data center design.[86][21] The integration strengthened HDR's multidisciplinary capabilities in commercial and mission-critical facilities, leading to the rebranding of Hurley Palmer Flatt as HDR in February 2022, which unified operations under a single global brand while retaining specialized teams.[87]

In June 2021, HDR acquired WKE, a Minnesota-based multimodal transportation engineering firm focused on rail, highway, and aviation projects, adding design, construction management, and program delivery expertise to deepen HDR's transportation portfolio.[88] Later that year, in September, HDR purchased WRECO, a California environmental consulting firm, incorporating 86 professionals skilled in habitat restoration and regulatory compliance to bolster water and environmental services.[81] These acquisitions were seamlessly integrated into HDR's employee-owned structure, expanding technical staff and geographic reach without disrupting ongoing projects.

HDR further targeted water infrastructure with the acquisition of Quest Engineers Inc., a Kentucky-based firm with 120 employees providing civil, structural, and electrical engineering for utilities, followed by SPF Water Engineering in April 2022, a Boise firm specializing in wastewater and hydrogeology.[89][90] Integrations emphasized cultural alignment with HDR's employee-ownership model, leveraging acquired talent for cross-market synergies in critical sectors like power and environmental management.

Outcomes and Expanded Capabilities

The acquisitions undertaken by HDR, Inc. have resulted in a marked broadening of its service portfolio, enabling the firm to deliver integrated solutions across diverse sectors including water management, transportation, and economic analysis integrated with engineering. By 2025, HDR had incorporated expertise from over 60 acquired entities since 1996, shifting from a primarily architecture and engineering-focused practice to a comprehensive provider encompassing planning, consulting, geospatial services, and construction management. This expansion has facilitated multidisciplinary project delivery, where economic modeling now informs infrastructure design, reducing risks and enhancing client value in public-sector investments.[11][85]

In the water sector, the February 2022 acquisition of SPF Water Engineering, a Boise, Idaho-based firm specializing in water, wastewater, and hydrogeologic consulting, strengthened HDR's capabilities in resource assessment and treatment infrastructure, allowing for end-to-end project handling from feasibility studies to regulatory compliance. Similarly, the acquisition of Quest Engineers Inc. extended HDR's civil engineering scope to include advanced water and wastewater project management across 12 service areas, improving operational efficiency in utility-scale developments. These integrations have positioned HDR to address complex environmental challenges, such as sustainable water supply systems amid increasing regulatory demands.[83][89]

Transportation services have similarly advanced through targeted buys, notably the June 2021 acquisition of WKE, a multimodal engineering firm, which added specialized design, construction management, and Northeast U.S. market depth, enabling HDR to manage larger-scale rail, highway, and transit projects with reduced silos between disciplines. The 2015 merger with CEI Architecture expanded HDR's Canadian operations, incorporating local architectural expertise for infrastructure and institutional facilities, thereby enhancing cross-border project execution in North America. In building engineering, the 2019 acquisition of Hurley Palmer Flatt Group in London augmented HDR's mechanical, electrical, and sustainability services for commercial and data center projects, fostering global standards compliance.[88][91][84]

A pivotal outcome has been the fusion of economic research with core engineering, exemplified by the early 2000s acquisition of HLB Decision Economics, which embedded quantitative forecasting into infrastructure planning; this has transformed HDR's approach to public funding decisions, yielding more resilient designs that account for long-term fiscal and demand variables. Collectively, these moves have elevated HDR's employee-owned model by distributing specialized talent across 200+ offices worldwide, boosting revenue through diversified revenue streams and competitive edges in integrated project delivery.[17][85]

Firm-Level Honors

HDR has been consistently recognized in industry rankings for its design and engineering prowess. In the 2025 Engineering News-Record (ENR) Top 500 Design Firms list, HDR ranked No. 6 overall among U.S.-based design firms and No. 3 among the Top 100 Pure Designers.[15] The firm also placed No. 5 in ENR's Top 20 Transportation design firms, No. 2 in Top 25 Bridges, and No. 5 in Top 25 Highways for 2024 rankings, reflecting sustained strength in infrastructure sectors.[3] Additionally, HDR ranked No. 6 in Consulting-Specifying Engineer's 2025 MEP Giants list, evaluating mechanical, electrical, and plumbing design revenue.[92]

As a 100% employee-owned firm, HDR has earned accolades for its ownership model and workplace culture. It ranked No. 6 on the National Center for Employee Ownership's 2023 Employee Ownership 100 list of America's largest majority employee-owned companies by revenue.[10] Forbes included HDR in its 2025 America's Best Large Employers list, based on employee surveys and company policies.[93] The firm has also been named a Top Workplace by various regional and national programs, including multiple certifications from Energage for employee satisfaction.[94]

Other firm-level honors include Canada's Top Employers for Young People in 2025, awarded by Mediacorp Canada Inc. for recruitment and retention initiatives targeting younger talent, marking the second consecutive year.[95] In the same year, HDR received Canada's Greenest Employers recognition from Mediacorp for sustainability programs.[3] The American Short Line and Regional Railroad Association granted HDR its 2025 Veterans Engagement Award for efforts supporting military veterans in the rail sector.[3] Earlier, the American Institute of Architects (AIA) Nebraska chapter named HDR Firm of the Year, citing its design excellence and regional impact.[96]

Project-Specific Accolades

HDR's projects have garnered recognition from industry bodies such as Engineering News-Record (ENR), the American Council of Engineering Companies (ACEC), and Fast Company for innovative design, sustainability, and execution. In 2025, the 30 Crossing highway improvement in New Jersey received ENR's Best Project Award in the Highway/Bridge category for its enhancements to traffic flow and safety along a critical corridor.[97] Similarly, the San Pedro Creek Culture Park in San Antonio earned a Merit Award in the Water/Wastewater category from ENR for transforming a buried creek into a public green space that mitigates flooding while providing recreational amenities.[97]

In transportation infrastructure, the I-90 Yellowstone Bridges replacement in Montana was awarded the Grand Project designation by ACEC's Montana chapter in 2025, acknowledging the engineering challenges overcome in reconstructing seismically resilient spans over the Yellowstone River.[98] The RiverFront Revitalization in Davenport, Iowa, secured ENR Midwest's Best Project Award in the Landscape/Urban Development category in 2024, as well as Fast Company's Innovation by Design Best Project Award in Urban Design, for redeveloping 60 acres of riverfront into mixed-use spaces emphasizing connectivity and environmental restoration.[99]

Healthcare and science facilities have also been honored; the Riverside Mental Health & Recovery Center in California received Fast Company's 2024 Innovation by Design Award for its psychiatric emergency services design, which integrates therapeutic environments to reduce patient agitation and staff stress. In water infrastructure, the Orange County Sanitation District Headquarters Complex was named a finalist in the 2025 World Architecture Festival and earned Fast Company's 2025 Innovation by Design recognition, alongside the 2024 Sustainable Project of the Year from USGBC California for its net-zero energy features and water recycling innovations.[100][101] These awards highlight HDR's contributions to project outcomes verified by peer-reviewed industry evaluations, though selections often reflect subjective criteria like innovation alongside measurable metrics such as cost savings and environmental impact.

Correctional Facility Designs

HDR, Inc. has designed over 275 jails and prisons across the United States, emphasizing evidence-based features such as natural light, rehabilitative programming spaces, and integrated mental health treatment to support security, staff wellness, and reduced recidivism.[102][58] The firm has developed two of the three correctional health facilities recognized by the U.S. Department of Justice as exemplary models, incorporating biophilic design principles and specialized care for inmate populations with untreated medical and mental health conditions.[58] Specific projects include the Illinois Department of Corrections In-Patient Treatment Center, providing 150 mental health beds and 50 medical beds on the Joliet campus, and the California Health Care Facility, focused on quality care within secure settings.[60][103]

Criticism of HDR's correctional designs primarily originates from prison abolitionist groups and formerly incarcerated individuals, who argue that no amount of redesign—such as "feminist" or gender-responsive facilities—can mitigate the inherent harms of incarceration, including family separation and sexual violence.[104][64] These activists have organized protests, including demonstrations outside HDR's Chicago office during the 2022 American Institute of Architects conference and weekly actions in Boston in 2021, demanding the firm withdraw from all carceral projects.[104] Such opposition has contributed to project delays, such as the 2021 pause of an $80 million women's jail in Travis County, Texas, following grassroots pressure on county commissioners.[104][102] Broader concerns, raised in investigative reporting, highlight how firms like HDR conduct needs assessments justifying jail expansions—often citing overcrowding and safety data—before securing design contracts, potentially influencing local policy toward larger facilities.[105]

Additional controversy surrounds HDR's monitoring of project opponents, including those resisting jail constructions, through its STRATA division, which analyzes public social media data to map dissent and inform client strategies.[102][106] This practice, applied to initiatives like a Greene County, Ohio, jail expansion, drew accusations of "corporate counterinsurgency" from activist groups, leading to HDR losing the design contract there despite eventual voter approval of the project.[105] A related 2021 class-action lawsuit, Davis v. HDR, Inc., alleged unlawful wiretapping of private Facebook groups monitoring opposition to infrastructure projects (including jails), but the case was dismissed in 2023 after courts ruled the groups lacked sufficient privacy protections.[107] HDR has defended these efforts as standard industry practices for community engagement, using public data to amplify voices and address concerns in public processes.[106]

Monitoring and Risk Assessment Practices

HDR, Inc. has implemented monitoring and risk assessment services to identify and mitigate potential opposition to its infrastructure projects, including correctional facilities. These practices involve analyzing social media activity, public records, and activist communications to map networks of resistance, which the firm describes as a proactive measure to manage "social license" risks. In internal documents obtained by investigative reports, HDR outlined its approach to leveraging large datasets for visualizing opposition dynamics, enabling clients such as government agencies to anticipate delays or cost overruns from protests.[102][108]

The firm's monitoring extended to both public and private online groups, prompting accusations of unethical surveillance. For instance, in projects involving jail expansions, HDR tracked Facebook groups opposing constructions in locations like Massachusetts and Connecticut, including efforts to assess activist strategies against proposed prisons. Critics, including prison abolition organizations, have labeled these tactics as a "corporate counterinsurgency," arguing they infringe on free speech and privacy by infiltrating or observing non-public discussions without consent. A 2021 class-action lawsuit, Davis v. HDR, Inc., alleged that HDR unlawfully monitored private communications of individuals opposing a highway project, claiming violations of privacy laws through unauthorized data collection.[102][107][109]

HDR defended its practices as standard industry risk management, emphasizing that monitoring relies on publicly available information and aims to protect project viability rather than suppress dissent. Company statements highlighted that unaddressed controversy can lead to financial losses, with one internal rationale noting, "Controversy is costly, both in reputation and in dollars. Social and political risk can delay or derail projects." The firm clarified it does not engage in illegal activities, such as hacking, and ceased certain monitoring after public scrutiny in 2021. However, advocacy groups like Building Up People Not Prisons continued to criticize HDR for prioritizing client interests over community concerns, particularly in correctional projects where opposition often stems from broader debates on incarceration policies.[106][108][64]

These risk assessment methods have not been independently audited for efficacy or ethics in peer-reviewed studies, though similar corporate monitoring tools are used by other engineering firms facing public pushback. While HDR's approach has arguably streamlined some project deliveries by preempting disruptions, it has fueled distrust among activists and led to calls for greater transparency in how firms like HDR evaluate socio-political risks.[106]

Legal and Public Backlash

In November 2021, Phoenix resident Carol Davis filed a class action lawsuit against HDR, Inc., alleging the firm violated the Federal Wiretap Act and Stored Communications Act by monitoring and collecting electronic communications from private Facebook groups opposing a highway construction project in Arizona.[109][110] The complaint claimed HDR deployed tools to access non-public group content without consent, purportedly to assess project risks for clients.[107] In March 2023, a federal court granted HDR's motion for summary judgment, dismissing the nationwide class action in a ruling described as a case of first impression under the Electronic Communications Privacy Act, finding no unlawful interception occurred.[111]

Public criticism intensified following 2021 reports that HDR's risk monitoring practices extended to tracking social media activity of activists opposing correctional facility projects, including jail expansions for government clients such as Greene County, Missouri.[102][112] Advocacy groups accused the firm of conducting "corporate counterinsurgency" by compiling weekly reports on "potential risks, influencers, and social networks" related to prison opponents, prompting HDR to defend the activities as standard public stakeholder analysis to mitigate controversy costs, not private surveillance.[106] Abolitionist organizations and formerly incarcerated individuals launched campaigns urging HDR to abandon correctional design contracts entirely, citing ethical concerns over profiting from incarceration infrastructure.[64]

Protests against HDR's prison-related work occurred outside its Chicago office in June 2022, where demonstrators, including architects and impacted community members, demanded the firm halt involvement in what they termed "feminist" or rehabilitative jail designs, arguing such projects perpetuate systemic harm despite purported humane features.[104] Separately, in November 2023, a Douglas County, Nebraska jury awarded $3.85 million to former HDR vice president Amy McAuliffe in a sex discrimination verdict, finding the firm liable for terminating her the day after she reported a colleague's conflict of interest, which she alleged was retaliatory and tied to gender bias.[113] In September 2025, HDR faced a $40 million negligence and breach-of-contract lawsuit from London Health Sciences Centre over defective window installations in a hospital renovation, highlighting ongoing project liability risks.[114]