He first started acting in theatre, performing in
Hamlet,
The Madman and the Nun, ''
A Midsummer Night's Dream and The Hollow in the Sand
. Delaney soon added screen acting to his resume, starring in the 2003 short film An Cuainín
, and in 2005 appearing in the Irish television series Pure Mule
and The Clinic
. He went on to play the lead in the RTÉ series Legend''. It was in 2006 that he first appeared before international audiences as Irish
revolutionary Teddy O'Donovan in Ken Loach's
The Wind That Shakes the Barley, opposite
Cillian Murphy. The film won the
Palme D'Or at the
2006 Cannes Film Festival, and Delaney was nominated for two 2007
Irish Film and Television Awards: Best Actor in a Supporting Role and Breakthrough Talent. Delaney was also honoured as the Irish Shooting Star for 2007 by the Berlin International Film Festival. Delaney was a cast member of the
Showtime series
The Tudors in which he plays
Anne Boleyn's brother
George In late 2007, Delaney appeared on stage at the
Tricycle Theatre in the role of Father Flynn in
John Patrick Shanley's play
Doubt: A Parable. He was reunited with Cillian Murphy and Liam Cunningham in 2009, his co-stars in
The Wind That Shakes The Barley, for the comedy
Perriers Bounty. In 2010, he filmed the role of Sundance in the western
Blackthorn alongside Sam Shepard, Eduardo Noriega, Stephen Rea and Nikolaj Coster-Waldau. Between 2013 and 2014, he starred in Martin McDonagh's dark comedy play
The Cripple of Inishmaan alongside
Daniel Radcliffe, which started out in London's West End and then transferred to Broadway. In 2015, he starred alongside Dev Patel and Jeremy Irons in
The Man Who Knew Infinity. Delaney acted in
Jeremy Renner's
Knightfall, which aired in 2017. == Personal life ==