Walker is a former American college and professional football player and a mixed martial artist from Georgia. He played college football for the University of Georgia, earned All-American honors three times and won the 1982 Heisman Trophy. Walker began his professional football career with the New Jersey Generals of the United States Football League (USFL), before joining the Dallas Cowboys of the National Football League (NFL). In the NFL, he also played for the Minnesota Vikings, Philadelphia Eagles and New York Giants. He was inducted into the College Football Hall of Fame in 1999.