ICF International

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.

When Geofon Incorporated was initially founded in 1983, the firm provided a range of geotechnical and environmental services to a variety of public and private clients throughout Southern California. The firm has greatly expanded its technical and geographical coverage, offering environmental engineering and remediation, civil construction and regulatory compliance for federal, local government and commercial clients throughout the Western United States. Geofon has also added regulatory, policy and processing services for the food industry. A significant portion of Geofon s business (more than $100 million) has come from its relationship with the United States Department of Defense, which dates back to 1984. The company also works with the U.S. Army Corps of Engineers and the Naval Facilities Engineering Command.

Tetra Tech is one of the leading providers of specialized management consulting and technical services. The company focuses on the areas of resource management, infrastructure, and communications. Tetra Tech was founded to provide engineering services related to waterways, harbors and coastal areas. The company has since increased the size and scope of its business and expanded its service offerings through a series of strategic acquisitions and internal growth. Tetra Tech provides environmental services, water and wastewater management, infrastructure services, security design and outsourced technical services. The company had nearly 7,500 employees located in more than 250 offices throughout the world. Tetra Tech was founded in 1966 and is based in Pasadena, Calif.