Michael O'Neill
Acting
​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.
Media of
Michael O'Neill
Photos (21)
Filmography of
Michael O'Neill
Secretary of Defense Walter Crystal
... 2025
Frank
... 2025
Joe Dean
... 2023
Christian
... 2021
Dell Connelly
... 2020
Chaplain David Kendricks
... 2019
Chaplain Rogers
... 2018
Beckwith
... 2018
Detective Simms
... 2014
Richard Barkley
... 2013
Senator McKellar
... 2011
Colonel Bethel
... 2010
CIA Director
... 2008
Bruce
... 2008
Ralph Christianson
... 2008
Tom Banacheck
... 2007
Cowboy
... 2004
Sheriff Smyth
... 2004
Ralph
... 2003
Mr. Pollard
... 2003
Gen. Matheson
... 2003
Lawyer Rodman
... 2000
O.B. Keeler
... 2000
ATF Asst. Director Ben Walker
... 1999
Greene
... 1999
Mr. Lusk
... 1998
... 1998
Cult Leader (Voice)
... 1998
Agent Moreland
... 1996
Jon Jordan
... 1995
Detective Brickman
... 1995
Ray Pasquerello
... 1994
Spencer Heymen
... 1994
Dick Britton
... 1993
Clark Thompson
... 1993
School Psychologist
... 1992
Serato
... 1992
Jergens
... 1992
Michael
... 1989
Raymond Brown
... 1989
Churchill
... 1981