Michael O'Neill

​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

Birth Location Montgomery, Alabama, USA
Born 1947-05-29

Movies

2024
Air as Joe Dean
2023
Cold Call as Christian
2021
The Stand at Paxton County as Dell Connelly
2020
Clemency as Chaplain David Kendricks
2019
Indivisible as Chaplain Rogers
2018
Danger One as Beckwith
2018
The Grim Sleeper as Detective Simms
2014
Dallas Buyers Club as Richard Barkley
2013
J. Edgar as Senator McKellar
2011
Green Zone as Colonel Bethel
2010
2008
Crazy as Ralph Christianson
2008
Transformers as Tom Banacheck
2007
Around the Bend as Cowboy
2004
American Crime as Sheriff Smyth
2004
Secondhand Lions as Ralph
2003
Seabiscuit as Mr. Pollard
2003
Dreamcatcher as General Matheson
2003
Traffic as Lawyer Rodman
2000
2000
ATF as Asst. A.T.F. Director Ben Walker
1999
The Mod Squad as Greene
1999
Dancer, Texas Pop. 81 as Mr. Lusk
1998
The Sunchaser as Agent Moreland
1996
Bushwhacked as Jon Jordan
1995
Awake to Danger as Detective Brickman
1995
Beyond Betrayal as Ray Pasquerello
1994
Blind Justice as Spencer Heymen
1994
For Their Own Good as Clark Thompson
1993
Lorenzo's Oil as School Psychologist
1992
Jennifer Eight as Serato
1992
1989
Sea of Love as Raymond Brown
1989
Ghost Story as Churchill
1981

Movies

The Emperor's Club Co-Producer
2002