Michael O'Neill
- Known for
- Acting
- Born
- May 29, 1951
- Birthplace
- Montgomery, Alabama, USA
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.
Filmography
War of the Worlds 2025
as Secretary of Defense Walter Crystal
Bride Hard 2025
as Frank
Air 2023
as Joe Dean
Cold Call 2021
as Christian
The Stand at Paxton County 2020
as Dell Connelly
Clemency 2019
as Chaplain David Kendricks
Indivisible 2018
as Chaplain Rogers
Danger One 2018
as Beckwith
On Yoga: The Architecture of Peace 2017
Producer
The Grim Sleeper 2014
as Detective Simms
Dallas Buyers Club 2013
as Richard Barkley
J. Edgar 2011
as Senator McKellar
Green Zone 2010
as Colonel Bethel
Flying Lessons 2010
as Chief Dobbs
Nothing but the Truth 2008
as CIA Director
A Quiet Little Marriage 2008
as Bruce
Crazy 2008
as Ralph Christianson
Transformers 2007
as Tom Banacheck
Around the Bend 2004
as Cowboy
American Crime 2004
as Sheriff Smyth
Secondhand Lions 2003
as Ralph
Seabiscuit 2003
as Mr. Pollard
Dreamcatcher 2003
as Gen. Matheson
The Emperor's Club 2002
Co-Producer
Traffic 2000
as Lawyer Rodman
The Legend of Bagger Vance 2000
as O.B. Keeler
ATF 1999
as ATF Asst. Director Ben Walker
The Mod Squad 1999
as Greene
Dancer, Texas Pop. 81 1998
as Mr. Lusk
Virtual Obsession 1998
Actor
Standoff 1998
as Cult Leader (Voice)
The Sunchaser 1996
as Agent Moreland
Bushwhacked 1995
as Jon Jordan
Awake to Danger 1995
as Detective Brickman
Beyond Betrayal 1994
as Ray Pasquerello
Blind Justice 1994
as Spencer Heymen
Victim of Love: The Shannon Mohr Story 1993
as Dick Britton
For Their Own Good 1993
as Clark Thompson
Lorenzo's Oil 1992
as School Psychologist
Jennifer Eight 1992
as Serato
The Gun in Betty Lou's Handbag 1992
as Jergens
An Unremarkable Life 1989
as Michael
Sea of Love 1989
as Raymond Brown
Ghost Story 1981
as Churchill
Credits from TMDB.