From 1998 to 2002, White found great success in mixed martial arts competition, compiling a record of 9-1 and winning the King of the Cage Middleweight Championship. White defended the title four times before losing a decision to MMA pioneer Jeremy Horn. This was especially impressive because at the time, King of the Cage was an upper echelon MMA promotion. He evolved into one of the more talented and well known mixed martial arts fighters in the world and developed excellent striking to go along with a solid submission wrestling base.