Day & Zimmermann Expands Military Construction Services with ECI Construction Acquisition.

Day & Zimmermann to integrate ECI Construction with Mason & Hanger, strengthening M&H's full-service design/build capabilities and extensive experience with U.S. military projects.

Mason & Hanger (M&H) is a full-discipline Architectural-Engineering-Construction firm headquartered in Lexington, Kentucky.

Founded in 1827, M&H is now the oldest continuously operating engineering and construction company in the United States, providing a rare stability and long-term reliability to our clients — and a tradition of delivering quality services that exceed our clients' expectations.

M&H is a member of the Day & Zimmermann family of companies. Day & Zimmermann accelerates customer success by delivering reliable managed services in maintenance and modification; staffing; architectural, engineering, construction, asset productivity and validation; government operations, logistics and munitions products; and security. Founded in 1901 and headquartered in Philadelphia, PA, today Day & Zimmermann operates from more than 150 worldwide locations and is ranked in the top 1% of privately held companies by Forbes magazine.

  Grand Coulee Dam

Lincoln Tunnel