Headquartered in Houston, Texas, GSI operates offices in Texas (Austin and Houston), California (Irvine, the San Francisco Bay Area, and Folsom), Washington (Olympia), Montana (Missoula and Helena), North Carolina (Raleigh), and New York (Syracuse). GSI employs cross-disciplinary teams of environmental engineers and scientists, including toxicologists, geologists, hydrogeologists, ecologists, chemists, oceanographers, and data scientists with seamless collaboration over both technical disciplines and offices.