Hartman was instrumental in serving to lure professional groups to Minnesota. In his autobiography “Sid!” (co-written with fellow Star Tribune sports activities columnist Patrick Reusse), Hartman wrote that in 1947 he provided $15,000 to the proprietor of the Detroit Gems of the Nationwide Basketball League for the franchise, then went to Detroit to ship the examine. The staff turned the Minneapolis Lakers, and Hartman was the de facto common supervisor. Led by huge man George Mikan, the Lakers gained the NBL championship of their first season and 5 NBA championships. Hartman left the Lakers operation in 1957, and the staff moved to Los Angeles in 1960.