the reebok pro summer league, known originally as the shaw's pro summer league, was a professional basketball developmental league hosted by the boston celtics of the national basketball association (nba) during the league's off-season at clark athletic center on the campus of the university of massachusetts boston. founded in 1999, the league planned a 2004 season, but was forced to fold due to the 2004 democratic national convention, which was being held in boston. from 1999 to 2002, the league was sponsored by grocery store chain shaw's. in 2003, footwear and apparel company reebok became the title sponsor of the league.