Person
Michael O'Neill
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 e…
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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.
Filmography
Movies and shows, newest first
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2025
War of the Worlds
Movie Secretary of Defense Walter Crystal
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2025
Bride Hard
Movie Frank
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2025
Happy Face
TV show D.A. Craig Calloway
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2024
Happy's Place
TV show Jim Jackoway
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2024
Tracker
TV show Buck Avery
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2023
Air
Movie Joe Dean
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2022
Fire Country
TV show Harlan Denbo
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2022
Echoes
TV show Victor McCleary
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2022
Outer Range
TV show Judge Pettigrew
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2021
Cold Call
Movie Christian
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2020
The Stand at Paxton County
Movie Dell Connelly
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2020
Messiah
TV show Cameron Collier
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2019
Clemency
Movie Chaplain David Kendricks
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2018
Indivisible
Movie Chaplain Rogers
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2018
The Romanoffs
TV show Ron Hopkins
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2018
Danger One
Movie Beckwith
More credits
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2018
Tom Clancy's Jack Ryan
TV show Senator Mitchell Chapin
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2018
The Resident
TV show Joshua Williams
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2017
S.W.A.T.
TV show Carl Luca
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2017
On Yoga: The Architecture of Peace
Movie Producer
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2016
Shooter
TV show Ray Brooks
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2016
This Is Us
TV show Arlo
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2016
11.22.63
TV show Arliss Price
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2014
Manhattan
TV show Psychiatrist
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2014
Extant
TV show Alan Sparks
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2014
The Grim Sleeper
Movie Detective Simms
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2013
Dallas Buyers Club
Movie Richard Barkley
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2013
Rectify
TV show Senator Roland Foulkes
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2013
Bates Motel
TV show Nick Ford
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2012
Vegas
TV show Mayor Ted Bennett
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2012
Scandal
TV show Lonnie Mencken
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2011
J. Edgar
Movie Senator McKellar
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2010
Law & Order: LA
TV show Jeb Monroe
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2010
Rizzoli & Isles
TV show Jonathan McKnight
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2010
The Glades
TV show Trent Staley
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2010
Green Zone
Movie Colonel Bethel
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2010
Flying Lessons
Movie Chief Dobbs
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2009
FlashForward
TV show CIA Director Keller
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2009
NCIS: Los Angeles
TV show Ret. U.S. Army General Richard Collins
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2008
Nothing But the Truth
Movie CIA Director
