Leon was a 6-3 high school All-American point guard at St. Monica Catholic in Santa Monica where he averaged 42 points a game his senior year and was first in CIF history with an all-time 33.7 ppg career average. He started college at the University of Arizona before transferring and becoming the first Division I All-American at Cal State Fullerton. He led the nation in assists his junior year. He was taken by Philadelphia 76ers in the first round of the 1984 NBA draft and had a six-year professional career. He won a gold medal with the 1984 USA Olympic Team in Los Angeles after previously winning a gold medal in the 1983 Pan-American Games. After retiring as a player, he became a NBA Referee in 1996 and has been an official for over 25 years. He was inducted into both the Orange County and Cal State Fullerton Athletics Hall of Fames.