In 2015, Hamm produced "The Journey", a fictionalized account of the behind-the-scenes peace brokerage between mortal enemies Ian Paisley and Sinn Féin politician Martin McGuinness. The film, written by Colin Bateman and starring Timothy Spall and Colm Meaney, was an official selection of the 2016 Toronto International Film Festival and the 73rd Venice International Film Festival and premiered to critical acclaim for the performances, especially that of Colm Meaney as Martin McGuinness.