Michael Lee Moorer is an American former professional boxer who competed from 1988 to 2008. He won a world championship on four occasions in two weight classes, having held the WBO light heavyweight title from 1988 to 1991; compiling 22 straight KOs in 22 fights and the WBO heavyweight title from 1992 to 1993; the unified WBA, IBF and lineal heavyweight titles in 1994; and regained the IBF heavyweight title again from 1996 to 1997 becoming a three-time heavyweight world champion.