 VANCOUVER, Wash.--BUSINESS WIRE--Barrett Business Services, Inc. BBSI NASDAQ: BBSI, a leading provider of business management solutions, and one of the largest professional employer organizations PEO in the U.S., today announced it is continuing to expand its national footprint with the opening of a branch office in Pittsburgh, PA. The company named Autumn Powell as Area Manager. She will be responsible for leveraging BBSIs unique business management expertise and employee related serv 