Michael O'Neill (actor)

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Michael O'Neill
OccupationFilm, television actor
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Michael O'Neill
OccupationFilm, television actor

Michael O'Neill is an American actor.

O'Neill grew up in Montgomery, Alabama and graduated from Auburn University in 1974.[1] After attending Auburn, he spent time under the tutelage of actor Will Geer and one of Geer's daughters, the actress Ellen Geer, at Theatricum Botanicum in Los Angeles before moving to New York to pursue his career there.

With a career stretching through three decades, he usually portrays senior law enforcement or military officers.[citation needed] He played Special Agent Ron Butterfield, the head of President Josiah Bartlet's Secret Service detail, on The West Wing, and CTU Administrative Director Richard Walsh in the first two episodes of 24. He played Sgt. Maj. Ron Cheals in CBS' action drama series The Unit. He starred in the Season 6 two-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.



1981Ghost StoryChurchill
1989Sea of LoveRaymond Brown
1992The Gun in Betty Lou's HandbagJergens
Jennifer EightAngelo Serato
Lorenzo's OilSchool Psychologist
1993For Their Own GoodClark ThompsonTelevision movie
Victim of Love: The Shannon Mohr StoryDick BrittonTelevision movie
1994Blind JusticeSpencer HeymanTelevision movie
Beyond BetrayalRay PasquerelloTelevision movie
On TrialHimselfTelevision movie
1995Awake to DangerDetective BrickmanTelevision movie
BushwhackedJon Jordan
1996Norma Jean & MarilynMr. KimmelTelevision movie
The SunchaserAgent Moreland
1998StandoffCult Leader (voice)
HostTelevision movie
Dancer, Texas Pop. 81Mr. Lusk
1999The Mod SquadDet. Carl Greene
A.T.F.Ben WalkerTelevision movie, Assistant Director
The Legend of Bagger VanceO.B. Keeler
2000TrafficLawyer Rodman
2002The Board RoomWalters
2003DreamcatcherGen. Matheson
SeabiscuitMr. Pollard
Secondhand LionsRalph
2004American CrimeSheriff SmythDirect-to-video
Around the BendCowboy
2007TransformersTom Banacheck
CrazyRalph Christianson
2008A Quiet Little MarriageBruce
2010Green ZoneColonel Bethel
2011J. EdgarSenator McKellar
2013Dallas Buyers ClubBarkley


1990H.E.L.P.CabotAre You There, Alpha Centauri?
1992L.A. LawMy Friend Flicker
1994Picket FencesProsecutor Larry AdlerSystem Down
1995Days of our LivesFather Jansen2 episodes
One West WaikikiManpower
1996The CapeKeith MasonThe Need to Know
1997The PretenderCaptain HarriganThe Better Part of Valor
MillenniumCounty Prosecutor Calvin SmithCovenant
OrleansLuther's Temptation
The Shining (TV mini-series)Dr. Daniel Edwards1 episode
1998The X-FilesThe Patrol CaptainDrive
1999RoswellPhillip EvansThe Morning After
JAGCmdr. BradleyShakedown
1999–2006The West WingSecret Service Agent Ron Butterfield16 episodes
2000Chicago HopeBill WyzinskiEverybody's Special at Chicago Hope
2001NYPD BlueCapt. Chuck DowlingPeeping Tommy
Diagnosis: MurderSheriff Buck O'HaraNo Good Deed
24Richard Walsh12:00 a.m.-1:00 a.m., 1:00 a.m.-2:00 a.m.
2001–2002Boston PublicDr. Bernard ColbertChapter Twenty-Four, Chapter Twenty-Seven, Chapter Twenty-Eight, Chapter Thirty-One
2002Ally McBealDr. ColbertAll of Me
Without a TraceThomas ShannonSilent Partner
2003Presidio MedBreathless
CarnivàleSheiff Lyle DonovanTipton
2004The PracticeJudge Robert TemplePolice State
Judging AmyD.A. Dave ShermanMy Little Runaway
Crossing JordanChris BenzOut of Sight
LAXAlonso MathewsUnscheduled Arrivals
2005Boston LegalDr. Robert McLeanIt Girls and Beyond
Cold CaseWarren Cousins 2005Revolution
ERCol. Ken KilnerHere and There
Commander in ChiefCongressman WilcoxFirst Strike, First Scandal
JAGMaj. Gen. Harold RossingFair Winds and Following Seas
2006Close to HomeDon WheelerThe Rapist Next Door
3 lbsJames WillsLost for Words
2006–2007The UnitRon ChealsFirst Responders, Dedication, SERE, Exposure, Off the Meter, Paradise Lost
The NinePete BurtonPilot, Heroes Welcome, The Inside Man
2007Lincoln HeightsCaptainSuspicion
K-VilleFather DennehyCritical Mass
Criminal MindsDet. YarboughAbout Face
2008Women's Murder ClubFBI Agent Ted ThorneNever Tell
The MentalistSheriff NelsonRedwood
Prison BreakHerb StantonShut Down, Selfless
My Own Worst EnemyAlexander DeSantosLove in All the Wrong Places
LeverageJudge RoyThe Bank Shot Job
2009FlashForwardCIA Director Mr. KellerGimme Some Truth
Ghost WhispererMale GhostGhost Busted
Army WivesReverent BankerdFamily Readiness, Disengagement
Sons of AnarchyJudge FranklinFa Guan
2010Numb3rsBoyd KeeneScratch
FringeSheriff VelchikJohari Window
Miami MedicalDr. Bruce Kaye88 Seconds
Grey's AnatomyGary ClarkSympathy for Parents, How Insensitive, Sanctuary, Death and All His friends
NCISFormer NCIS Special Agent Riley McCallisterEnemies Foreign, Enemies Domestic
2012VegasMayor Ted BennettPilot
2014ExtantAlvin Sparks


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