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.
Movie | War of the Worlds | 2025 | |
Movie | Air | Joe Dean | 2023-04-05 |
Series | Echoes | Victor McCleary | 2022-08-19 |
Movie | Cold Call | Christian | 2021-02-04 |
Movie | The Stand at Paxton County | Dell Connelly | 2020-05-02 |
Movie | Clemency | Chaplain David Kendricks | 2019-12-27 |
Series | The Resident | Joshua Williams | 2018-01-21 |
Movie | Danger One | Beckwith | 2018-09-14 |
Movie | Indivisible | Chaplain Rogers | 2018-10-26 |
Series | 11.22.63 | Mr. Price | 2016-02-15 |
Movie | The Grim Sleeper | Detective Simms | 2014-03-15 |
Series | Extant | Alan Sparks | 2014-07-09 |
Series | Bates Motel | Nick Ford | 2013-03-18 |
Series | Rectify | Senator Roland Foulkes | 2013-04-22 |
Movie | Dallas Buyers Club | Richard Barkley | 2013-11-01 |
Series | Scandal | Lonnie Mencken | 2012-04-05 |
Movie | J. Edgar | Senator McKellar | 2011-11-09 |
Series | Rizzoli & Isles | Jonathan McKnight | 2010-07-12 |
Series | The Glades | Trent Staley | 2010-07-11 |
Movie | Green Zone | Colonel Bethel | 2010-03-11 |
Series | FlashForward | CIA Director Keller | 2009-09-24 |
Series | Fringe | Unknown | 2008-09-09 |
Movie | Crazy | Ralph Christianson | 2008-03-02 |
Series | The Mentalist | Sheriff Nelson | 2008-09-23 |
Movie | Nothing But the Truth | CIA Director | 2008-12-19 |
Movie | A Quiet Little Marriage | Bruce | 2008-10-18 |
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 | American Crime | Sheriff Smyth | 2004-04-06 |
Movie | Around the Bend | Cowboy | 2004-10-08 |
Movie | Dreamcatcher | General Matheson | 2003-03-21 |
Movie | Seabiscuit | Mr. Pollard | 2003-07-22 |
Movie | Secondhand Lions | Ralph | 2003-09-19 |
Series | 24 | Richard Walsh | 2001-11-06 |
Movie | The Legend of Bagger Vance | O.B. Keeler | 2000-11-02 |
Movie | Traffic | Lawyer Rodman | 2000-12-27 |
Movie | The Mod Squad | Greene | 1999-03-26 |
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 | Virtual Obsession | 1998-02-01 | |
Movie | Dancer, Texas Pop. 81 | Mr. Lusk | 1998-05-01 |
Movie | The Sunchaser | Agent Moreland | 1996-05-29 |
Movie | Awake to Danger | Detective Brickman | 1995-03-12 |
Series | Blue Murder | Bruce Lyons | 1995-09-14 |
Movie | Bushwhacked | Jon Jordan | 1995-08-04 |
Movie | Blind Justice | Spencer Heymen | 1994-06-25 |
Series | Chicago Hope | Unknown | 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 | The Gun in Betty Lou's Handbag | Jergens | 1992-08-21 |
Movie | Jennifer Eight | Serato | 1992-11-06 |
Movie | Lorenzo's Oil | School Psychologist | 1992-12-30 |
Movie | An Unremarkable Life | Michael | 1989-10-12 |
Movie | Sea of Love | Raymond Brown | 1989-09-15 |
Series | Bodyline | Viv Richardson | 1984-03-19 |
Movie | Molly | Lyle | 1983-12-27 |
Movie | Ghost Story | Churchill | 1981-12-18 |
Movie | Joyride | Henderson's Assistant | 1977-08-17 |