Headquarters. Pasadena, Calif.

Branch Offices. Parsons operates in 46 states and 37 countries.

Roots. The Ralph M. Parsons Co. was founded in 1944 to provide engineering, procurement, and construction services for government, petrochemical, and infrastructure clients.

Areas of Expertise. Parsons is a full-service planning, engineering, and construction company that specializes in project management and technology.

Key Markets. Homeland security, federal services, water and infrastructure, institutional, environmental, aviation, roads and highways, bridges and tunnels, rail and transit, systems engineering, urban planning and design, commercial and industrial, communications networks, and critical facilities.