Mason & Hanger, a Day & Zimmermann Company, is dedicated to providing architectural and engineering (A/E) services, specializing in worldwide design of secure, mission-driven facilities, proudly serving as a partner to the United States Government for nearly two centuries. Mason & Hanger is a trusted partner of the U.S. Department of Defense, Department of Defense Reserves, Department of Homeland Security, Department of State, Department of Energy, the Intelligence Community, among other governm