Acting · Montgomery, Alabama, USA · Born May 29, 1947
From Wikipedia, the free encyclopedia. Michael O'Neill (born May 29, 1951) is an American actor. With a career stretching through three decades, he usually portrays senior law enforcement or military officers. He is perhaps best known for his role as Special agent Ron Butterfield, the head of President Josiah Bartlet's Secret Service detail, on The West Wing. He played CTU Administrative Director Richard Walsh in the first two episodes of 24. He played Sgt. Maj. Ron Cheals in the CBS action-drama series The Unit. He starred in the Season Six 2 part Finale of Grey's Anatomy as the broken widower who holds the hospital hostage with a 9mm while pursuing the doctors responsible for unplugging his wife. His most notable film performances occur in Seabiscuit, Secondhand Lions, Transformers, Dancer, Texas Pop 81, Traffic, Sea of Love, A Quiet Little Marriage, Nothing But the Truth, and Green Zone. O'Neill graduated from Auburn University in 1974. After attending Auburn he spent time under the tutelage of actor Will Geer and his daughter, Ellen, at Theatricum Botanicum in Los Angeles before moving to New York to pursue his career there.
MovieWar of the Worlds
2025
as Secretary of Defense Walter Crystal
MovieBride Hard
2025
as Frank
TVHappy Face
2025
as D.A. Craig Calloway
TVHappy's Place
2024
as Jim Jackoway
TVTracker
2024
as Buck Avery
MovieAir
2023
as Joe Dean
TVFire Country
2022
as Harlan Denbo
TVEchoes
2022
as Victor McCleary
TVOuter Range
2022
as Judge Pettigrew
MovieCold Call
2021
as Christian
MovieThe Stand at Paxton County
2020
as Dell Connelly
TVMessiah
2020
as Cameron Collier
MovieClemency
2019
as Chaplain David Kendricks
MovieIndivisible
2018
as Chaplain Rogers
TVThe Romanoffs
2018
as Ron Hopkins
MovieDanger One
2018
as Beckwith
TVTom Clancy's Jack Ryan
2018
as Senator Mitchell Chapin
TVThe Resident
2018
as Joshua Williams
TVS.W.A.T.
2017
as Carl Luca
TVShooter
2016
as Ray Brooks
TVThis Is Us
2016
as Arlo
TV11.22.63
2016
as Arliss Price
TVManhattan
2014
as Psychiatrist
TVExtant
2014
as Alan Sparks
MovieThe Grim Sleeper
2014
as Detective Simms
MovieDallas Buyers Club
2013
as Richard Barkley
TVRectify
2013
as Senator Roland Foulkes
TVBates Motel
2013
as Nick Ford
TVVegas
2012
as Mayor Ted Bennett
TVScandal
2012
as Lonnie Mencken
MovieJ. Edgar
2011
as Senator McKellar
TVLaw & Order: LA
2010
as Jeb Monroe
TVRizzoli & Isles
2010
as Jonathan McKnight
TVThe Glades
2010
as Trent Staley
MovieGreen Zone
2010
as Colonel Bethel
MovieFlying Lessons
2010
as Chief Dobbs
TVFlashForward
2009
as CIA Director Keller
TVNCIS: Los Angeles
2009
as Ret. U.S. Army General Richard Collins
MovieNothing but the Truth
2008
as CIA Director
TVLeverage
2008
as Judge Roy
MovieA Quiet Little Marriage
2008
as Bruce
TVThe Mentalist
2008
as Sheriff Nelson
TVFringe
2008
as Sheriff Velchik
TVSons of Anarchy
2008
as Anthony Franklin
MovieCrazy
2008
as Ralph Christianson
MovieTransformers
2007
as Tom Banacheck
TVArmy Wives
2007
as Reverend Bankerd
TVThe Nine
2006
as Pete Burton
TVThe Unit
2006
as Ron Cheals
TVCommander in Chief
2005
as Congressman Wilcox
TVGhost Whisperer
2005
as Nolan
TVCriminal Minds
2005
as Det. Yarbough
TVClose to Home
2005
as Don Wheeler
TVPrison Break
2005
as Herb Stanton
TVGrey's Anatomy
2005
as Gary Clark
TVNumb3rs
2005
as Boyd Keene
MovieAround the Bend
2004
as Cowboy
TVBoston Legal
2004
as Dr. Robert McLean
TVLAX
2004
as Alonso Mathews
MovieAmerican Crime
2004
as Sheriff Smyth
TVNCIS
2003
as Riley McCallister
MovieSecondhand Lions
2003
as Ralph
MovieSeabiscuit
2003
as Mr. Pollard
MovieDreamcatcher
2003
as Gen. Matheson
TVWithout a Trace
2002
as Thomas Shannon
TVCSI: Miami
2002
as Jerry Blackburn
TV24
2001
as Richard Walsh
TVCrossing Jordan
2001
as Chris Benz
MovieTraffic
2000
as Lawyer Rodman
MovieThe Legend of Bagger Vance
2000
as O.B. Keeler
TVBoston Public
2000
as Dr. Bernard Colbert
TVRoswell
1999
as Philip Evans
TVThe West Wing
1999
as Ron Butterfield
MovieATF
1999
as ATF Asst. Director Ben Walker
MovieThe Mod Squad
1999
as Greene
MovieDancer, Texas Pop. 81
1998
as Mr. Lusk
MovieVirtual Obsession
1998
MovieStandoff
1998
as Cult Leader (Voice)
TVAlly McBeal
1997
as Dr. Colbert
TVThe Shining
1997
as Daniel Edwards (uncredited)
TVThe Practice
1997
as Judge Robert Temple
TVMillennium
1996
as County Prosecutor Calvin Smith
MovieThe Sunchaser
1996
as Agent Moreland
TVJAG
1995
as Commander Bradley
MovieBushwhacked
1995
as Jon Jordan
MovieAwake to Danger
1995
as Detective Brickman
MovieBeyond Betrayal
1994
as Ray Pasquerello
TVER
1994
as Col. Ken Kilner
TVChicago Hope
1994
as Bill Wyzinski
TVOne West Waikiki
1994
MovieBlind Justice
1994
as Spencer Heymen
MovieVictim of Love: The Shannon Mohr Story
1993
as Dick Britton
TVDiagnosis: Murder
1993
as Sheriff Buck O'Hara
TVThe X-Files
1993
as Patrol Captain Van Gelder
MovieFor Their Own Good
1993
as Clark Thompson
MovieLorenzo's Oil
1992
as School Psychologist
MovieJennifer Eight
1992
as Serato
MovieThe Gun in Betty Lou's Handbag
1992
as Jergens
MovieAn Unremarkable Life
1989
as Michael
MovieSea of Love
1989
as Raymond Brown
MovieGhost Story
1981
as Churchill
