Servicing a vast range of markets. GSG Consultants has played a key role in shaping the infrastructure of the Midwest. Since ... our founding in 1992, we have earned a reputation for providing outstanding and accurate services in the most time-sensitive environments. GSG brings together over 100 professionals and technical staff in the following disciplines: Geotechnical Services, Environmental Engineering, Construction Management, Natural Resources, Design Services, and Program Management. read more