GZA GeoEnvironmental, Inc. | 18,248 followers on LinkedIn. Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc. (GZA) has grown into a full-service company providing its clients with highly diversified technical services supporting our core practice areas. GZA employs over 700 engineers, scientists, and technical support staff in 32 offices throughout the U.S.