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AECOM is an international professional technical services company providing consulting, design, program and construction management and operations and maintenance support to the transportation, environmental and building industries. The company serves both government and private clients. AECOM also provides technical support, international development assistance, and mining and power services. AECOM is headquartered in Los Angeles and operates additional offices throughout the United States., Canada, Asia, the Middle East, Africa, Australia and Europe.

HDR Engineering is an engineering operating company of HDR, which is one of the leading, employee-owned firms that offers architectural, engineering and consulting services for several residential and commercial projects in the United States. Founded in 1917, the company offers architectural design, master planning, engineering, and functional and space programming services. Its clients include the Advocate Christ Medical Center, Cape Fear Valley Health System, Huntington Memorial Hospital and Durham Research Center. HDR works with a team of more than 7,900 staff members. It maintains over 170 locations worldwide. The company serves clients in the transportation, health care, science, technology, municipal, energy, and oil and gas industries. HDR operates HDR Architecture.