Allen has the distinction of being the only player to have won the Heisman Trophy, named Unanimous All-American, won an AFCA National Championship Trophy, the Super Bowl, and be named NFL MVP and Super Bowl MVP.

[4][5] Watching Allen in the 1977 CIF Title game against Kearny High School, one saw the emergence of a superstar.

Allen led the Lincoln team to a 34–6 victory, scoring five touchdowns, including one after intercepting a pass.

[8] As a freshman in 1978, Allen was a member of the Trojans' National Championship team (as recognized by the coaches poll), playing as a backup to eventual Heisman Trophy winning running back Charles White.

Allen shares the NCAA record for most 200-yard rushing games with Ricky Williams and Ron Dayne, each completing the feat twelve times.

Though his rookie season was shortened by a league strike, Allen rushed for 697 yards and led the Raiders to the best record in the AFC at 8–1.

[8] During the 1985 season, he rushed for 1,759 yards and scored 11 touchdowns on 380 carries, leading the Raiders to a 12–4 record and the AFC West Division Championship.

[citation needed] In total, Allen rushed 58 times for 466 yards and four touchdowns during the playoffs.

[11] Allen ended the 1985 season on a strong note, finishing the year as the NFL rushing leader with 9 consecutive 100-yard games.

Initially, Allen was commended for his gracious nature and team spirit for sharing the spotlight during the prime of his career.

Allen was relegated to back-up duty in his final three seasons with the Raiders and, at one time, fell to fourth on the depth chart.

With the retirement of Eric Dickerson in 1993, Allen became the active leader in career rushing yards, a position he maintained until being passed by Barry Sanders in Game 1 of 1997.

[18][19] In 2008, Allen joined as a spokesman for the sports website OPENSports.com, the brainchild of Mike Levy, founder and former CEO of CBS Sportsline.com.

Allen wrote a blog and occasionally answered member questions for the company during this time.[when?

[23] Sports agent Mike Gilbert (who had represented both Allen and Simpson) and actress Robin Greer both also claimed in O.J.