James Metcalfe Campbell Bower is an English actor, singer, and model. He made his feature film debut in 2007 with a supporting role in Sweeney Todd: The Demon Barber of Fleet Street. He 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 2022, Bower featured as Henry Creel / Vecna in the fourth season of the Netflix series Stranger Things, for which he received critical acclaim.
In the 2010s, Bower was part of the main casts of the fantasy series Camelot on Starz and Will on TNT. From 2015 to 2020, he was the frontman of the London-based band Counterfeit. In 2020 he started releasing music as a solo artist.