Christopher S. Green has joined the Nashville office of TTL Inc. as environmental group leader.

Green brings technical expertise in hydrogeology and karst processes, as well as project management experience.

Green — a registered professional geologist and a member of the Society of American Military Engineers — earned his bachelor’s degree in geology from Austin Peay State University and his master’s degree in hydrogeology from Illinois State University.

TTL provides geotechnical engineering, analytical laboratory testing, construction materials testing and environmental consulting services.