ECS is a full-service mechanical, electrical, plumbing, fire protection and telecommunication consulting engineering firm. We provide a high level of technical expertise; Experience, Commitment and Service is paramount in meeting our client’s expectations. Partners: Jason Bolzenius and Dennis Harris Mailing Address: 9986 Manchester Road, Suite 202, St. Louis M0 63122 Point of Contact: Dennis Harris Email: Dennis@ECSstl.com Telephone: 314-755-1920