Day & Zimmermann

Founded in 1901 and headquartered in Philadelphia, Pennsylvania, Day & Zimmermann operates from more than 150 worldwide locations. The company provides architecture, engineering, procurement and construction services; plant maintenance and modification services; manufacturing, storage and demilitarization of ammunition; protective services to government installations, utilities and industrial customers; technology staffing services; and validation services to the pharmaceutical and biopharmaceutical industries. Brands: Day & Zimmerman, Day & Zimmerman NPS, Mason & Hanger Group, Yoh