He turned professional at an early age in 1974, working in a club job before embarking on a tournament career several years later. He made his first appearance on the European Tour in 1979 and his last in 2003. That same year he made his only appearance in the World Cup of Golf.
Upon turning 50 in 2008, Mitchell joined the European Seniors Tour.
European Tour wins (3) 1992 Mitsubishi Austrian Open European Seniors Tour wins (4).