Skidmore, Owings & Merrill LLP (SOM) is an American architectural, urban planning and engineering firm. It was founded in 1936 by Louis Skidmore and Nathaniel Owings in Chicago. In 1939, they were joined by engineer John Merrill. The firm opened its second office, in New York City, in 1937 and has since expanded, with additional offices in San Francisco, Los Angeles, Washington, D.C., London, Melbourne, Hong Kong, Shanghai, Seattle, and Dubai.
KlingStubbins was an architectural, engineering, interior, and planning firm headquartered in Philadelphia, with offices in Cambridge, Massachusetts; Raleigh, North Carolina; San Francisco; Washington, D.C.; and Beijing. In 1982, the Franklin Institute awarded Vincent G. Kling the Frank P. Brown Medal.
HOK, formerly Hellmuth, Obata + Kassabaum and legally HOK Group, Inc., is an American design, architecture, engineering, and urban planning firm, founded in 1955.
WSP USA, formerly Parsons Brinckerhoff, is an American multinational engineering and design firm. The firm operates in the fields of strategic consulting, planning, engineering, construction management, energy, infrastructure and community planning. It is a subsidiary of WSP Global.
David Magie Childs is an American architect and chairman of the architectural firm Skidmore, Owings & Merrill. He is the architect of the new One World Trade Center in New York City.
CHA Consulting, Inc. is an international engineering consulting and construction management firm headquartered in Albany, New York. The firm was founded in 1952 by John Clarkeson, P.E., in Boston, Massachusetts and focused on civil design work. The firm was subsequently purchased by Ronald Clough and renamed Clough & Associates. Ronald Clough then partnered with Bill Harbour and the firm was renamed Clough, Harbour & Associates, LLP.
HNTB Corporation is an American infrastructure design firm. Founded in 1914 in Kansas City, Missouri, HNTB began with the partnership made by Ernest Emmanuel Howard with the firm Waddell & Harrington, founded in 1907.
Louis Berger is a full-service engineering, architecture, planning, environmental, program and construction management and economic development firm based in Morristown, New Jersey. Founded in 1953 in Harrisburg, Pennsylvania by Dr. Louis Berger, the firm employs nearly 6,000 employees in more than 50 countries worldwide. The company was acquired by WSP Global in 2018.
Thornton Tomasetti is a global, 1,500-plus person scientific and engineering consulting firm.
Gensler is a global design and architecture firm headquartered in San Francisco, California. It is the largest architecture firm in the world by revenue and number of architects.
HDR, Inc. is an American design and engineering company based in Omaha, Nebraska.
Fentress Architects is an international design firm known for large-scale public architecture such as airports, museums, university buildings, convention centers, laboratories, and high-rise office towers. Some of the buildings for which the firm is best known include Denver International Airport (1995), the modernized Tom Bradley International Terminal at LAX (2013), the National Museum of the Marine Corps near Quantico, Virginia (2005), and the Green Square Complex in Raleigh, North Carolina (2012).
HED (formerly Harley Ellis Devereaux) is an architecture and engineering firm based in Royal Oak, Michigan with offices in Royal Oak, Chicago, Illinois, Los Angeles, Sacramento, California, San Diego, Denver, Colorado, Dallas, Texas, Boston, Massachusetts and San Francisco, California. The firm was founded in 1908 by architects Alvin E. Harley and Norman S. Atcheson.
Wiss, Janney, Elstner Associates, Inc. (WJE) is an American corporation of architects, engineers, and materials scientists specializing in the investigation, analysis, testing, and design of repairs for historic and contemporary buildings and structures. Founded in 1956, WJE is headquartered in Northbrook, Illinois, and has over 600 professionals in twenty offices across the United States. WJE personnel are specialized in architectural, structural, and civil engineering; materials conservation, chemistry and petrography, and testing and instrumentation.
Weidlinger Associates, Inc., was a U.S.-based structural engineering firm that designs and rehabilitates buildings, bridges, and infrastructure and provides special services in applied science, forensics, and physical security. Weidlinger's clients include corporations, private clients, institutions, and federal, state and local governments. The firm is headquartered in New York City, with branch offices in Massachusetts, Connecticut, New Jersey, California, New Mexico, and Washington, DC. The firm also conducted business as Weidlinger Associates, Ltd., in Scotland, UK.
Suffolk Construction Company stylized as Suffolk is an American construction contracting company based in Boston, Massachusetts with additional locations in California, Florida, Maine, New York and Texas. The company is contracted for work in the aviation, commercial, education, healthcare, gaming, residential, mission critical, and government sectors. Suffolk is the largest construction contractor in Massachusetts and one of the 20 largest in the country.
Magnusson Klemencic Associates is an American structural and civil engineering consulting firm with its headquarters in Seattle, Washington. The company has completed projects worth more than $99 billion in 48 states and 54 countries. Significant MKA projects through its history include the World Trade Center, the Columbia Center, Aqua, the Doha Convention Center Tower, the Olympic Sculpture Park, and Salesforce Tower.
CDM Smith is an engineering and construction company headquartered in Boston, Massachusetts. CDM Smith offers services in water, environment, transportation, and energy and facilities projects for public and private clients. Major services include design, consulting and program management with a focus on emerging areas such as polyfluoroalkyl substances (PFAS), transportation advisory services, lead in drinking water and digital solutions. The employee-owned company is currently ranked 23rd on Engineering News-Record's 2022 Top 500 Design Firms list and 22nd on their 2021 Top 200 Environmental Firms list.
DeSimone Consulting Engineering is a structural engineering firm founded by Vincent J. DeSimone in 1969 in New York City. The firm provides structural engineering services to architects, owners and developers, and performs structural analysis and design for all types of buildings at all project phases. DeSimone also launched a Property Loss Consulting division in 2016. The company has offices in Boston, Chicago, Dallas-Fort Worth, Foxborough, Houston, Las Vegas, Miami, New Haven, New York City, San Francisco, London, Medellín, Abu Dhabi, and Dubai. DeSimone has designed over 10,000 projects in 40 states and 45 countries.
Jaros, Baum & Bolles Consulting Engineers, LLP (JB&B) is an American MEP and consulting engineering firm founded in 1915 by Alfred L. Jaros, Jr. and Albert L. Baum. The firm is best known for high-rise projects, including One World Trade Center and Hudson Yards in New York City, the Willis Tower in Chicago, and the Bank of China Tower in Hong Kong. In 2020, JB&B was named New York's Design Firm of the Year by Engineering-News Record magazine.
