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