 After college, Beisser joined the Phillips Oilers in the Amateur Athletic Union (AAU) and teamed with Bob Kurland, a two-time NCAA champion and future Basketball Hall of Famer, to lead the Oilers to three straight national championships in 1946, 1947 and 1948.Phillips then defeated the University of Kentucky in a 1948 Olympic Games playoff match.As a result, Beisser was selected as an alternate for the United States men's national basketball team.