 Having boxed occasionally since 1984, Bush won his first title in the sport on February 3, 1994, by defeating Lynn Jackson via technical knockout in round ten in Virginia Beach for the USBA Southern Light Middleweight (-69.9 kg/154 lb) belt.This earned him the spot as the IBF #1 Intercontinental contender.Returning to kickboxing, he became a four time world champion when he won a unanimous twelve-round decision over Tom Montgomery in Brighton, England to be crowned the ISKA World Super Welterweight (-69.5 kg/153.2 lb) Full Contact Champion, setting up a unification fight with Roberto Fatica at the Dundonald International Ice Bowl in Belfast, Northern Ireland in 1996.