GNSA is a Payroll, Human Resource, and Benefits Administration firm specializing in serving the small to middle market. Started in 1997, GNSA has steadily grown from year-to year as more and more companies have identified GNSA as the premier outsourced service provider. At GNSA we believe that the strength of the United States economy resides in the small to mid-market, therefore GNSA has focused its efforts towards better serving this segment. Great Northern Staff Administrators is a professional outsource service provider committed to proactively assisting our clients in becoming more successful. Our values and integrity drive us to provide the highest level of customer service and to continuously improve our services to fit our client’s needs. GNSA is headquartered in Portland, Oregon.