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Michael O'Neill

​From Wikipedia, the free encyclopedia. Michael O'Neill 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.

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Movie/TV Credits:
First Appeared:
In the movie Joyride 1977-08-17
Latest Project:
Movie Clemency 2019-12-27
Known For
Poster of FlashForward
Poster of Prison Break
Poster of The West Wing
Poster of The X-Files
Movie Clemency Chaplain David Kendricks 2019-12-27
Movie Indivisible Chaplain Rogers 2018-10-26
Movie Danger One Beckwith 2018-09-14
Series 11.22.63 Mr. Price 2016-02-15
Series Extant Alan Sparks 2014-07-09
Movie The Grim Sleeper Detective Simms 2014-03-15
Movie Dallas Buyers Club Richard Barkley 2013-11-17
Series Rectify Senator Roland Foulkes 2013-04-22
Series Bates Motel Nick Ford 2013-03-18
Movie J. Edgar Senator McKellar 2011-11-09
Movie Green Zone Colonel Bethel 2010-03-11
Series The Glades Trent Staley 2010-07-11
Series Rizzoli & Isles Jonathan McKnight 2010-07-12
Series FlashForward CIA Director Keller 2009-09-24
Movie A Quiet Little Marriage Bruce 2008-11-07
Series The Mentalist Sheriff Nelson 2008-09-23
Series Fringe Unknown 2008-09-09
Movie Crazy Ralph Christianson 2008-03-02
Movie Transformers Tom Banacheck 2007-06-27
Series The Nine Pete Burton 2006-10-04
Series Prison Break Unknown 2005-08-29
Series Grey's Anatomy Unknown 2005-03-27
Movie Around the Bend Cowboy 2004-10-08
Movie American Crime Sheriff Smyth 2004-04-06
Movie Dreamcatcher General Matheson 2003-03-21
Movie Secondhand Lions Ralph 2003-09-19
Movie Seabiscuit Mr. Pollard 2003-07-22
Series 24 Richard Walsh 2001-11-06
Movie The Legend of Bagger Vance O.B. Keeler 2000-11-02
Movie Traffic Lawyer Rodman 2000-03-23
Series Roswell Unknown 1999-10-06
Series The West Wing Unknown 1999-09-22
Movie ATF Asst. A.T.F. Director Ben Walker 1999-09-06
Movie Dancer, Texas Pop. 81 Mr. Lusk 1998-05-01
Movie Virtual Obsession 1998-02-01
Movie The Sunchaser Agent Moreland 1996-05-29
Series Chicago Hope 1994-09-18
Movie For Their Own Good Clark Thompson 1993-04-05
Movie Victim of Love: The Shannon Mohr Story Dick Britton 1993-11-09
Series The X-Files Unknown 1993-09-10
Movie Lorenzo's Oil School Psychologist 1992-12-30
Movie Jennifer Eight Serato 1992-11-06
Movie An Unremarkable Life Michael 1989-10-12
Movie Sea of Love Raymond Brown 1989-09-15
Series Bodyline Viv Richardson 1984-07-16
Movie Molly Lyle 1983-12-27
Movie Ghost Story Churchill 1981-12-18
Movie Joyride Henderson's Assistant 1977-08-17