Day Zimmermann

Day & Zimmermann is a family-owned diversified company founded in 1901 and based in Philadelphia, Pennsylvania. It has evolved from a consulting partnership focused on manufacturing efficiency into a broad-based firm specializing in engineering, construction, defense, and workforce solutions. The company operates across several sectors, including engineering and construction, where it provides design and modernization services for various projects. It also manages operations and maintenance for facilities like power plants and military installations. In addition, Day & Zimmermann offers staffing and workforce solutions, helping clients meet their personnel needs. Its security and defense services include munitions production and support for government clients. With a workforce of over 50,000 employees, Day & Zimmermann serves a diverse range of customers, including industrial manufacturers, public utilities, and government agencies. The company is recognized for its commitment to innovation and customer service, guided by its core value: "We do what we say®."