Langan Engineering & Environmental Services, a privately held consulting firm with 500 employees in 14 offices around the world, has acquired Treadwell & Rollo, a premier geotechnical and environmental engineering firm based in San Francisco.
The acquisition, the first in Langan�s 40-year history, firmly establishes a nationwide footprint for the company by adding 70 high-caliber professionals from Treadwell & Rollo�s California offices in San Francisco, Oakland, San Jose, and Sacramento.