He is a British professional boxer. He is currently a unified world heavyweight champion, having held the IBF title since 2016, and the WBA (Super) and IBO titles since April 2017. He has won all 18 of his professional fights by knockout. He previously held the British and Commonwealth heavyweight titles from 2015 to 2016. As an amateur he represented Britain at the 2012 Olympics, winning a gold medal in the super-heavyweight division; he also represented England at the 2011 World Championships, winning silver.