Brían F. O'Byrne is an Irish actor best known for his television roles as Colin in Brotherhood (2007-2008) and as recovering alcoholic Aaron Stark in FlashForward, from 2009-2010.
He also starred in the 2011 mini-series Mildred Pierce, for which he was nominated for an Emmy award.
The Tony Award-winning O'Byrne starred in The International, opposite Clive Owen and directed by Tom Tykwer. He also co-starred in Antoine Fuqua's Brooklyn's Finest and Terrence Malick's Tree of Life.
His other film appearances include No Reservations, opposite Catherine Zeta-Jones, and Sidney Lumet's Before The Devil Knows You're Dead, opposite Ethan Hawke.
Lumet's film was recognised by the Broadcast Film Critics (Critics Choice Awards), the Boston Society of Film Critics, the New York Online Film Critics and at The Gotham Awards for the Best Ensemble Cast.
Prior to that he chilled audiences in William Friedkin's adaptation of the off-Broadway play Bug, opposite Ashley Judd and Michael Shannon.
He also appeared in Terrence Malick's The New World, opposite Colin Farrell, Clint Eastwood's Oscar-winning Million Dollar Baby, two films for Barry Levinson – Bandits and An Everlasting Piece, and Tim Blake Nelson's The Grey Zone.
On television, he appeared as a regular in the critically acclaimed Showtime series, Brotherhood. Other television credits include the Hallmark Hall of Fame production of Blackwater Lightship, HBO's Oz and Law & Order: SVU.
In 2007, he starred as the title character in the docudrama Alexander Hamilton as part of PBS' award winning American Experience series.
On Broadway, O'Byrne starred in Tom Stoppard's groundbreaking trilogy, The Coast of Utopia, directed by Jack O'Brien, opposite Ethan Hawke and Billy Crudup. For his portrayal of the play's central figure, he received his fifth Tony nomination for his performance (Best Actor in a Play).
O'Byrne has received Tony nominations for The Lonesome West, The Beauty Queen of Leenane and Doubt. He won the Tony for his portrayal of a murderous pedophile in 2004's Frozen.
Prior to The Coast of Utopia, he starred opposite Oliver Platt in the Broadway production of Shining City, directed by Robert Falls for the Manhattan Theatre Club.
He received his fourth consecutive Drama Desk Award nomination for The Coast of Utopia and won the award for Doubt, and is also the recipient of the Outer Critics Circle Award for Doubt, as well as the Obie Award and the Lucille Lortel Award for Frozen.
O'Byrne credits his training at the Samuel Beckett Centre, Trinity College in Dublin for his many successes.