Mann was drafted in the third round of the 1983 NFL Draft by the Washington Redskins and by his second season, he was the starting left defensive end, opposite to Dexter Manley [REF].
Mann finished his career with the Redskins with 82 sacks, second-most in franchise history, and 17 forced fumbles, the most in franchise history, and also won Super Bowl XXII and Super Bowl XXVI [REF].