He  is a British former professional boxer who competed from 2004 to 2013. He held multiple titles at middleweight, including the IBF title in 2013; the Commonwealth title from 2007 to 2009; the British title in 2009; and the European title from 2010 to 2011. As an amateur, Barker represented England at the 2002 Commonwealth Games and won a gold medal in the light-welterweight division.