Roy Jones Jr.

American professional boxer who holds dual American and Russian citizenship. He has held multiple world championships in four weight classes, including titles at middleweight, super middleweight, light heavyweight, and heavyweight, and is the only boxer in history to start his professional career at light middleweight and go on to win a heavyweight title. As an amateur boxer he represented the United States at the 1988 Summer Olympics, winning a light middleweight silver medal after one of the most controversial decisions in boxing history.