​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.
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A young half-Navajo convict dying of cancer forces a yuppie doctor to drive him to a magic healing l...
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If you were a brilliant young scientist diagnosed with only months to live, what choices would you m...
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Four guys, best friends, have grown up together in DANCER, TEXAS POP. 81, a tiny town in West Texas....
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Three youthful delinquents escape conviction for their crimes by teaming with the LAPD....
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World War I has left golfer Rannulph Junuh a poker-playing alcoholic, his perfect swing gone. Now, h...
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Four childhood friends reunite for a hunting trip in the Maine woods, bound by a psychic force born ...
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True story of the undersized Depression-era racehorse whose victories lifted not only the spirits of...
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The comedic adventures of an introverted boy left on the doorstep of a pair of reluctant, eccentric ...
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A news team hunts for a serial killer who stalks victims via videotape and then records the ghastly ...
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A tale of four generations of men, all of whom have had their offspring at a young age: a great-gran...
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Young teenager Sam Witwicky becomes involved in the ancient struggle between two extraterrestrial fa...
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When reporter Rachel Armstrong writes a story that reveals the identity of a covert CIA operative, t...
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During the U.S.-led occupation of Baghdad in 2003, Chief Warrant Officer Roy Miller and his team of ...
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Loosely based on the true-life tale of Ron Woodroof, a drug-taking, women-loving, homophobic man who...
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Journalist Christine Pelisek helps law enforcement investigate the alleged serial killer known as th...
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While transporting a dying man to the hospital, two paramedics find a million dollars in cash sewn i...
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Recent movies
| # | Name | Character | Rating | |
|---|---|---|---|---|
| 1 | Bride Hard (2025) | Frank | - | - |
| 2 | War of the Worlds (2025) | Secretary of Defense Walter Crystal | 2.5 | |
| 3 | Air (2023) | Joe Dean | 7.1 | |
| 4 | Clemency (2019) | Chaplain David Kendricks | 6.7 | |
| 5 | Danger One (2018) | Beckwith | - | - |
| 6 | The Grim Sleeper (2014) | Detective Simms | - | - |
| 7 | Dallas Buyers Club (2013) Oscars 2014 | Richard Barkley | 8.1 | |
| 8 | J. Edgar (2011) | Senator McKellar | 6.3 | |
| 9 | Green Zone (2010) | Colonel Bethel | 6.5 | |
| 10 | Nothing but the Truth (2008) | CIA Director | 6.9 | |
| 11 | Crazy (2008) | Ralph Christianson | - | - |
| 12 | Transformers (2007) Oscars 2008 | Tom Banacheck | 7 | |
| 13 | American Crime (2004) | Sheriff Smyth | - | - |
| 14 | Around the Bend (2004) | Cowboy | 6 | |
| 15 | Dreamcatcher (2003) | Gen. Matheson | 5.8 | |
| 16 | Seabiscuit (2003) Oscars 2004 | Mr. Pollard | 6.3 | |
| 17 | Secondhand Lions (2003) | Ralph | 7.1 | |
| 18 | Traffic (2000) Oscars 2001 | Lawyer Rodman | 6.9 | |
| 19 | The Legend of Bagger Vance (2000) | O.B. Keeler | 6.8 | |
| 20 | The Mod Squad (1999) | Greene | 4 | |
| 21 | ATF (1999) | ATF Asst. Director Ben Walker | 5 | |
| 22 | Virtual Obsession (1998) | - | - | - |
| 23 | Dancer, Texas Pop. 81 (1998) | Mr. Lusk | 4 | |
| 24 | The Sunchaser (1996) | Agent Moreland | - | - |
| 25 | Bushwhacked (1995) | Jon Jordan | 10 | |
| 26 | Awake to Danger (1995) | Detective Brickman | - | - |
| 27 | Victim of Love: The Shannon Mohr Story (1993) | Dick Britton | - | - |
| 28 | The Gun in Betty Lou's Handbag (1992) | Jergens | 5 | |
| 29 | Jennifer Eight (1992) | Serato | 4.3 | |
| 30 | Lorenzo's Oil (1992) | School Psychologist | 7 | |
| 31 | Sea of Love (1989) | Raymond Brown | 7 | |
| 32 | Ghost Story (1981) | Churchill | 5.4 |
