Headquarters. Baton Rouge, La.

Branch Offices. The firm has 10 offices in the United States, Canada, and England.

Roots. Stone & Webster was founded in Boston in 1889 as an electrical testing laboratory and consulting firm.

Areas of Expertise. Stone & Webster provides planning, engineering, design, procurement, construction, operation, and maintenance and management services.

Key Markets. Power generation; petrochemical, refining, and gas processing services; environmental services, including water/wastewater treatment, hazardous waste management and remediation, and facility siting; engineering services; and construction and consulting services.