The Day & Zimmermann Group, Inc.

Leveraging over 120 years of experience with innovative workforce solutions to ensure organizations are meeting their business goals.

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 government agencies critical to the U.S. National Security Mission.

introducing day & zimmermann open shop, who we are, and our objective of providing employment opportunities to our craft work force.