Mason & Hanger

Mason & Hanger, a Day & Zimmermann Company, is an architecture and engineering firm based in Lexington, Kentucky that specializes in designing secure, mission-driven facilities for various U.S. government agencies. Established in 2005, the company employs approximately 326 people and has served as a trusted partner to the U.S. Department of Defense, Department of Homeland Security, and other government entities critical to national security for nearly two centuries.