 VANCOUVER, Wash.--BUSINESS WIRE-- BBSI--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 Nashville, TN. The company named Dion Matos as Area Manager. He will be responsible for leveraging BBSIs unique business management expertise and employee related service i 