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