Headquarters. New York City

Branch Offices. Parsons Brinckerhoff employs more than 9,000 people in 200 offices on six continents.

Roots. William Barclay Parsons, the founder of the firm, established an office in Manhattan in 1885.

Areas of Expertise. This company's core services include environmental, planning, management consulting, design/engineering, construction management, operations and maintenance, e-business and e-media, and program management.

Key Markets. Buildings, environment, power, telecom, and transportation.