Mason attended Park Vista Community High School in Boynton Beach, Florida, where he was a standout football and basketball player, and also ran track.

[5] In his first college game, Auburn against Utah State, Mason returned a kick-off 97 yards for a touchdown.

[9] In the 2014 BCS National Championship Game, Mason rushed for 195 yards on 34 carries and a touchdown in a 34–31 defeat by the Florida State Seminoles.

He finished his season with 1,816 rushing yards, breaking the school record held by Heisman winner Bo Jackson (1,786 set in 1985).

[14] In Week 7, 2014 in a game against the Seattle Seahawks, Mason ran for 85 yards on 18 carries with 1 touchdown in a St. Louis win.

[16] Coach Jeff Fisher stated "I tried numerous times to reach him, he has made a decision not to communicate with us, not to talk.

[21] Former college teammate Ricardo Louis stated in April 2017 that Mason was working towards coming back to the NFL for the upcoming season.

[24] With increased playing time, Mason proved to be a key contributor to a lackluster Roughriders offense, including producing a 20-carry, 117-yard effort during the 2018 Banjo Bowl, a Riders win.

[26] His father, Vincent Mason, is a member of hip hop group De La Soul.

[29] Mason was arrested in January 2017 for the incident and charged with a third degree felony of fleeing and eluding without regard for others' safety or property.