Salem Sportswear early 1990’s Boston Celtics Training Camp Tee. The Boston Celtics were founded in 1946 as one of the league’s original eight teams. Since that time, they have won 17 championships. The Celtics rose to dominance in the late 50s with the acquisition of the legendary center, Bill Russell. Along with a number of other future Hall of Famers, the Celtics would go on to win eight consecutive NBA championships. All of them throughout the 1960s