Stephen began his career at the Abbey Theatre before moving to London. His most recent appearance at the Abbey was in Ages of the Moon by Sam Shepard (also in New York and London). His first theatre role in London was as Tommy Owens in The Shadow of a Gunman with Jack McGowranat the Mermaid Theatre. He worked extensively at the National Theatre and the Royal Court where he worked with Samuel Beckett on Endgame. Recent theatre credits include Tales of Ballycumber (Abbey Theatre), Sam Shepard’s A Particle Of Dread (Derry and New York) and Ballyturk (Galway and National Theatre).
He was a founder member of Field Day Theatre Company with Brian Friel.
Television credits include Dickensian and War and Peace for the BBC. Films include Nothing Personal, Stuck, V for Vendetta, Breakfast on Pluto, The River Queen, Control, Ulysses, Evelyn, The End of the Affair, Guinevere, Still Crazy, In Dreams, The Butcher Boy, Fever Pitch, Trojan Eddie, Michael Collins, The Devil and the Deep Blue Sea, Prêt a Porter, Interview with a Vampire, Princess Caraboo, Angie, Bad Behaviour, The Crying Game, Life is Sweet, The Company of Wolves, Loose Connections and Angel.
Stephen won the Best Supporting Actor BAFTA award in 2015 for his role in The Honourable Woman, and was nominated for that same award in 2012 for The Shadowline. He received an Oscar nomination and a Golden Globe nomination for The Crying Game and a Tony Award nomination for Someone Who’ll Watch Over Me.