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The Day & Zimmermann Group, Inc.

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Officers and directors

Harold L. Yoh
Chairman and CEO
Joseph W. Ritzel
SVP Finance and CFO
Sankara Viswanathan


1500 Spring Garden St #900
Philadelphia, PA 19130-4067
+1-215-299-8000 (Phone)
215-299-1548 (Fax)

Website links

Fortune 100 companies and the Government depend on the soundness of Day & Zimmermann -built structures, day and night. The company provides engineering, construction, and plant maintenance; staffing; munitions manufacturing and demilitarization; defense solutions, and various government services. Founded in 1901, Day & Zimmermann also offers operations, contract support, and maintenance services to government agencies and commercial customers. The company's NPS unit maintains half of nuclear plants in the US, while its staffing subsidiary Yoh Services specializes in filling IT, engineering, and health care positions.

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