Geotechnical & Environmental Services, Inc. (GES) is a leading geotechnical engineering, construction materials testing and special inspections, and environmental consulting firm with offices in Las Vegas, Mesquite and Reno, Nevada. GES is highly ranked by government agencies across Nevada with a reputation for being a best place to work in the country. Our mission is to make our clients successful by taking the time to understand their expectations and then meet or exceed those expectations, in our continuing effort to be a premier professional organization in the western United States where the best people in our profession ant to work. Established in 1992 by Gregory P. DeSart, P.E., C.E.M., the firm has worked on some of the most important projects in Nevada with significant experience in the Commercial, Residential and Infrastructure segments of the industry.