He served as the interim head football coach at Southern Methodist University (SMU) for the final 10 games of the 2014 season upon the resignation of June Jones, compiling a record of 1–9.
Mason also served as the interim head football coach at Boise State University for the first ten games of the 1996 season, compiling a record of 1–9.
He then joined head coach Pokey Allen as defensive coordinator at Portland State University, where the Vikings participated in the NCAA Division II playoffs in six out of seven years with two appearances in the national title game.
Following Allen to Boise State as defensive coordinator, Mason coached the 1994 Broncos to the NCAA Division I-A title game.
In October 2018, Mason was named linebackers coach for the Memphis Express of the Alliance of American Football (AAF).