He was a consensus All-American in 1974 and 1975 and a member of consecutive national championship teams for the Oklahoma Sooners in 1974 and 1975.

The 1996 Walter Camp "Alumnus of the Year" was voted to the Oklahoma Sports Hall of Fame [3] in 1992.

Selmon played in six straight Pro Bowls and was named NFL Defensive Player of the Year in 1979.

Buccaneer assistant Abe Gibron said, "Selmon has no peers" at defensive end, while former Detroit Lions coach Monte Clark compared him to "a grown man at work among a bunch of boys".

In January 2008, Selmon was voted by a panel of former NFL players and coaches to Pro Football Weekly's All-Time 3-4 defensive team along with Harry Carson, Curley Culp, Randy Gradishar, Howie Long, Lawrence Taylor and Andre Tippett.

Selmon stayed in Tampa, Florida, working as a bank executive and being active in many charities.

From 1993 to 2001, Selmon served as an assistant athletic director at the University of South Florida under Paul Griffin.

Selmon suffered a massive stroke on September 2, 2011, which left him hospitalized in extremely critical[9] condition.

The USF football team wore a #63 decal on their helmets for the 2011 season, as did the Tampa Bay Buccaneers.