TES has extensive experience conducting ecological investigations. Most staff members have degrees in either biology, wildlife management, or forestry. Specialties include fisheries, aquatic invertebrates, botany, forestry, herpetology, mammology, and ornithology. The ecological expertise of the TES staff has been employed on a great variety of projects, including hydroelectric, fossil-fueled, and nuclear power plants, airports, landfills, electric and gas transmission lines, hazardous waste site assessments, and a wide assortment of commercial development projects.