James Metcalfe Campbell Bower (born 22 November 1988) is an English actor and singer. He made his feature film debut in 2007 with a supporting role in Sweeney Todd: The Demon Barber of Fleet Street, and went on to feature in The Twilight Saga, The Mortal Instruments: City of Bones, and as the young Gellert Grindelwald in Harry Potter and the Deathly Hallows – Part 1 and Fantastic Beasts: The Crimes of Grindelwald. In the 2010s, Bower was part of the main casts of the historical series Camelot on Starz and Will on TNT.