Mann was a key position player and won Collingwood's best and fairest in 1954. He also finished second in 1948 and again in 1953. Mann also polled well in the Brownlow Medal, finishing runner-up in 1954 after being third the previous season. He was Collingwood vice captain from 1950 to 1955 and was captain in 1956. He represented Victoria at interstate football from 1954 until 1956. In 1972, after 14 years as coach of the Collingwood reserves, he stepped up to coach the league side, spending three years as the senior coach.
Mann died on 22 February 2013 after battling ill health in recent years.