He played junior for the Newmarket Redmen from 1931 to 1933, winning the Memorial Cup with them in 1933. Mann then played two seasons of senior amateur hockey in Toronto. In 1935-36 Mann turned pro with the Syracuse Stars. He continued to play pro, mostly in the minors, until 1943. After that Mann played another three years of senior amateur. He played for the Cleveland Barons in 1946-47 and returned to the amateur ranks. retiring in 1949.