Mann was selected in the seventh round of the
1954 NFL draft by the
Chicago Cardinals in the
National Football League. He played for the Cardinals for three seasons as a punter,
running back, and a
special teams member. He then went to the
Canadian Football League where he played for the
Toronto Argonauts. On the eve of the 1959 season, Mann was arrested after a raid on his apartment discovered about $100 worth of marijuana. Although he was acquitted at trial in February 1960, the Argonauts elected not to play him pending the outcome of the trial, forcing Mann to sit out the whole 1959 season. When released in the start of the 1959 season, he played for the
Bramalea Satellites, being called back to the Argos as if the Bramalea team were a
taxi squad. He played in 12 seasons in the CFL, exclusively for the Argonauts, where he played in 155 regular season games. As a running back and flanker, he had 204 carries for 1,071 yards with seven touchdowns and 204 receptions for 3,025 yards with ten touchdowns. On special teams, Mann was successful on 22 of 51 field goal attempts, 73 of 81 on convert attempts, punted 1,261 times for a 44.2-yard average with 87 singles, had 140 kickoffs for a 56.3-yard average with one single, and had two kick return touchdowns. He shares the
CFL record for longest missed field goal return after Boyd Carter returned a kick 15 yards and then lateralled the ball to Mann who returned it another 116 yards for a touchdown in a game against the
Montreal Alouettes on August 22, 1958. After leading the league in receptions and receiving yards in 1960 and 1961, Mann was named an East Division All-Star at flanker in both years. ==Coaching career==