Yoh was the nation’s first technology staffing firm.  As a business unit of Day & Zimmermann, Yoh has a burgeoning global footprint, as our parent company operates from more than 150 worldwide locations. Delivering industry-leading staffing services represents only one facet of our parent company’s capabilities, as Day & Zimmermann’s companies today provide architectural-engineering-construction services, power plant maintenance and modification services, validation services to businesses and government agencies, and munitions production, equipment maintenance and facilities management services to the Department of Defense.