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Michael O'Neill
Actor · Producer
Tells you when a new project gets a date
1947Born, Montgomery
80Credits
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…
Known for
TransformersTom Banacheck
Grey's AnatomyGary Clark
Dallas Buyers ClubRichard Barkley
Prison BreakHerb Stanton
The MentalistSheriff Nelson2025War of the WorldsSecretary of Defense Walter CrystalMovie
2025Bride HardFrankMovie
2025Happy FaceD.A. Craig Calloway · 5 episodesShow
2024Happy's PlaceJim Jackoway · 2 episodesShow
2024TrackerBuck Avery · 1 episodeShow
2023AirJoe DeanMovie
2022Fire CountryHarlan Denbo · 1 episodeShow
2022EchoesVictor McCleary · 7 episodesShow
2022Outer RangeJudge Pettigrew · 2 episodesShow
2021Cold CallChristianMovie
2020The Stand at Paxton CountyDell ConnellyMovie
2020MessiahCameron Collier · 5 episodesShow
2019ClemencyChaplain David KendricksMovie
2018IndivisibleChaplain RogersMovie
2018The RomanoffsRon Hopkins · 1 episodeShow
2018Danger OneBeckwithMovie
2018Tom Clancy's Jack RyanSenator Mitchell Chapin · 5 episodesShow
2018The ResidentJoshua Williams · 1 episodeShow
2017S.W.A.T.Carl Luca · 3 episodesShow
2016ShooterRay Brooks · 3 episodesShow
2016This Is UsArlo · 1 episodeShow
201611.22.63Arliss Price · 1 episodeShow
2014ManhattanPsychiatrist · 1 episodeShow
2014ExtantAlan Sparks · 13 episodesShow
2014The Grim SleeperDetective SimmsMovie
2013Dallas Buyers ClubRichard BarkleyMovie
2013RectifySenator Roland Foulkes · 15 episodesShow
2013Bates MotelNick Ford · 8 episodesShow
2012VegasMayor Ted Bennett · 4 episodesShow
2012ScandalLonnie Mencken · 5 episodesShow
2011J. EdgarSenator McKellarMovie
2010Law & Order: LAJeb Monroe · 1 episodeShow
2010Rizzoli & IslesJonathan McKnight · 1 episodeShow
2010The GladesTrent Staley · 1 episodeShow
2010Green ZoneColonel BethelMovie
2010Flying LessonsChief DobbsMovie
2009FlashForwardCIA Director Keller · 1 episodeShow
2009NCIS: Los AngelesRet. U.S. Army General Richard Collins · 1 episodeShow
2008Nothing but the TruthCIA DirectorMovie
2008LeverageJudge Roy · 1 episodeShow
2008A Quiet Little MarriageBruceMovie
2008The MentalistSheriff Nelson · 1 episodeShow
2008FringeSheriff Velchik · 1 episodeShow
2008Sons of AnarchyAnthony Franklin · 1 episodeShow
2008CrazyRalph ChristiansonMovie
2007TransformersTom BanacheckMovie
2007Army WivesReverend Bankerd · 2 episodesShow
2006The NinePete Burton · 3 episodesShow
2006The UnitRon Cheals · 6 episodesShow
2005Commander in ChiefCongressman Wilcox · 2 episodesShow
2005Ghost WhispererNolan · 1 episodeShow
2005Criminal MindsDet. Yarbough · 1 episodeShow
2005Close to HomeDon Wheeler · 1 episodeShow
2005Prison BreakHerb Stanton · 1 episodeShow
2005Grey's AnatomyGary Clark · 3 episodesShow
2005Numb3rsBoyd Keene · 1 episodeShow
2004Around the BendCowboyMovie
2004Boston LegalDr. Robert McLean · 1 episodeShow
2004LAXAlonso Mathews · 1 episodeShow
2004American CrimeSheriff SmythMovie
2003NCISRiley McCallister · 3 episodesShow
2003Secondhand LionsRalphMovie
2003SeabiscuitMr. PollardMovie
2003DreamcatcherGen. MathesonMovie
2002Without a TraceThomas Shannon · 1 episodeShow
2002CSI: MiamiJerry Blackburn · 1 episodeShow
200124Richard Welsh, Richard Walsh · 1 episodeShow
2001Crossing JordanChris Benz · 1 episodeShow
2000TrafficLawyer RodmanMovie
2000The Legend of Bagger VanceO.B. KeelerMovie
2000Boston PublicDr. Bernard Colbert · 4 episodesShow
1999RoswellPhilip Evans · 1 episodeShow
1999The West WingRon Butterfield · 15 episodesShow
1999ATFATF Asst. Director Ben WalkerMovie
1999The Mod SquadGreeneMovie
1998Dancer, Texas Pop. 81Mr. LuskMovie
1998Virtual ObsessionMovie
1998StandoffCult Leader (Voice)Movie
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