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Acting
Brían Francis O'Byrne (born 16 May 1967) is an Irish actor who works mostly in the United States. He was born in Mullagh, County Cavan. O'Byrne first attracted notice for his performances in the Martin McDonagh plays The Beauty Queen of Leenane (1996) as Pato Dooley (for which he received a Tony Award nomination for Best Featured Actor in a Play) and The Lonesome West (1997). He is known for taking on serious and dramatic roles, such as a serial killer in Frozen (1998) (for which he won a Tony Award) and a priest accused of child molestation in Doubt (2004), for which he received a Tony nomination. O'Byrne also appeared as a priest in the 2004 film Million Dollar Baby. In May 2007, O'Byrne was nominated for a Tony Award for his performance as Alexander Herzen in Tom Stoppard's 2002 trilogy The Coast of Utopia. In 2011, he was nominated for the Primetime Emmy Award for Outstanding Supporting Actor in a Miniseries or a Movie for his performance in Mildred Pierce as Bert Pierce.

Prisoner
as Harrison Dempsey

The Abandons
as Walter Paxton

Dead of Winter
as Tall Hunter

Conclave
as O'Malley

Twig
as Leon

The Wonder
as John Flynn

My Salinger Year
as Hugh

Sergio
as Gil Loescher

Lincoln Rhyme: Hunt for the Bone Collector
as The Bone Collector

Hatton Garden
as Basil

Nightflyers
as Auggie

Manhunt
as Frank McAlpine

Little Boy Blue
as Steve Jones

The Magicians
as Mayakovsky

Saints & Strangers
as John Billington

The Bastard Executioner
as Baron Ventris

Aquarius
as Ken Karn

Queen & Country
as RSM Digby

The Last Ship
as Sean Ramsey

Jimmy's Hall
as Commander O'Keefe

Medeas
as Ennis

Gilded Lilys
as Edwin Lily

Prime Suspect
as Reg Duffy

Mildred Pierce
as Bert Pierce

Love/Hate
as Inpector Mick Moynihan

Brooklyn's Finest
as Det. Ronny Rosario

FlashForward
as Aaron Stark

The International
as The Consultant

Before the Devil Knows You're Dead
as Bobby Lasorda

No Reservations
as Sean

Alexander Hamilton
as Alexander Hamilton

Bug
as Dr. Sweet

Brotherhood
as Colin

The New World
as Lewes

Million Dollar Baby
as Father Horvak

The Blackwater Lightship
as Larry

Easy
as Mick McCabe

Intermission
as Mick

Mapmaker
as Richie Markey

Bandits
as Darill Miller

Disco Pigs
as Gerry

The Grey Zone
as Interrogator

An Everlasting Piece
as George

Law & Order: Special Victims Unit
as Liam Connors

Amongst Women
as Luke

The Fifth Province
as Timmy

The Last Bus Home
as Jessop

Oz
as Padraic Connelly

Avenue X
as Sonny

American Experience
as Alexander Hamilton

Hallmark Hall of Fame
as Larry

One Sweet Hour
as Colum Byrne
Seahorse
as George