Mann was a defensive end for the Wolf pack during the years of 1979-1982. Mann was named Most Valuable Defensive Lineman for the Big Sky Conference in 1982. In his senior year o 1982, he led the Big Sky in sacks with a total of 14. As Nevada’s highest drafter ever in the NFL, Mann was drafted in 1983 by the Washington Redskins. Mann had eight seasons with more than 60 tackles for the Redskins. In 1992, he had a career high; 91 total tackles with 46 solos. The Redskins were Super Bowl champions in 1987 and 1991. Mann finished his career during the 1994 season with the San Francisco 49ers and added his third Super Bowl championship ring before retiring. When he retired, Mann was among the top ten active sack leaders in the NFL. He then went on to sports broadcasting and hosted a TV show in the Washington DC area.