Michael O'Neill
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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.
Known for
Credits
War of the Worlds (2025)
as Secretary of Defense Walter Crystal
Traffic (2000)
as Lawyer Rodman
Air (2023)
as Joe Dean
Dallas Buyers Club (2013)
as Richard Barkley
Bride Hard (2025)
as Frank
Transformers (2007)
as Tom Banacheck
Green Zone (2010)
as Colonel Bethel
Dreamcatcher (2003)
as Gen. Matheson
Secondhand Lions (2003)
as Ralph
Sea of Love (1989)
as Raymond Brown
Seabiscuit (2003)
as Mr. Pollard
The Legend of Bagger Vance (2000)
as O.B. Keeler
Lorenzo's Oil (1992)
as School Psychologist
J. Edgar (2011)
as Senator McKellar
ATF (1999)
as ATF Asst. Director Ben Walker
Nothing but the Truth (2008)
as CIA Director
Cold Call (2021)
as Christian
The Mod Squad (1999)
as Greene
Bushwhacked (1995)
as Jon Jordan
Jennifer Eight (1992)
as Serato
The Sunchaser (1996)
as Agent Moreland
Ghost Story (1981)
as Churchill
Around the Bend (2004)
as Cowboy
Blind Justice (1994)
as Spencer Heymen
Danger One (2018)
as Beckwith
A Quiet Little Marriage (2008)
as Bruce
The Grim Sleeper (2014)
as Detective Simms
Flying Lessons (2010)
as Chief Dobbs
Dancer, Texas Pop. 81 (1998)
as Mr. Lusk
Virtual Obsession (1998)
Actor
Indivisible (2018)
as Chaplain Rogers
American Crime (2004)
as Sheriff Smyth
The Gun in Betty Lou's Handbag (1992)
as Jergens
Clemency (2019)
as Chaplain David Kendricks
For Their Own Good (1993)
as Clark Thompson
Crazy (2008)
as Ralph Christianson
An Unremarkable Life (1989)
as Michael
Standoff (1998)
as Cult Leader (Voice)
Beyond Betrayal (1994)
as Ray Pasquerello
Awake to Danger (1995)
as Detective Brickman
The Stand at Paxton County (2020)
as Dell Connelly
Victim of Love: The Shannon Mohr Story (1993)
as Dick Britton