Graham joined the Metropolitan Police in 1989 and in 2016 was promoted to the rank of Inspector. He became a Christian in 2005 after hearing the gospel from a wonderfully persistent vicar during the Christening of his son. He states that the gospel has radically changed his life in ways that he could not have previously imagined. Graham has a passion to see as many people as possible changed by the transforming message of Jesus Christ. He especially has a heart for the children and youth and works in this area both inside the police and in his spare time. He has been an ambassador since 2006 and joined the leadership team in late 2014, and in 2018 took on the position of Deputy Chairperson.