Follow About Us Covalent is an Atlanta based Engineering Firm with expertise in Mechanical, Electrical, Plumbing and Fire Protection systems. We’ve been working in a wide variety of markets and project types since 2002. Our engineers are licensed in many states, and work in nearly all building types and markets. To learn more, please call us today at (404) 355-9334. Principal: Patrick Wilkes, P.E. Principal: Fred Gordon, P.E.