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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.
as Secretary of Defense Walter Crystal
as Frank
as D.A. Craig Calloway(5 eps)
as Jim Jackoway(2 eps)
as Buck Avery(1 ep)
as Joe Dean
as Harlan Denbo(1 ep)
as Victor McCleary(7 eps)
as Judge Pettigrew(2 eps)
as Christian
as Dell Connelly
as Cameron Collier(5 eps)
as Chaplain David Kendricks
as Chaplain Rogers
as Ron Hopkins(1 ep)
as Beckwith
as Senator Mitchell Chapin(5 eps)
as Joshua Williams(1 ep)
as Carl Luca(3 eps)
as Ray Brooks(3 eps)
as Arlo(1 ep)
as Arliss Price(1 ep)
as Psychiatrist(1 ep)
as Alan Sparks(13 eps)
as Detective Simms
as Richard Barkley
as Senator Roland Foulkes(15 eps)
as Nick Ford(8 eps)
as Mayor Ted Bennett(4 eps)
as Lonnie Mencken(5 eps)
as Senator McKellar
as Jeb Monroe(1 ep)
as Jonathan McKnight(1 ep)
as Trent Staley(1 ep)
as Colonel Bethel
as Chief Dobbs
as CIA Director Keller(1 ep)
as Ret. U.S. Army General Richard Collins(1 ep)
as CIA Director
as Judge Roy(1 ep)
as Bruce
as Sheriff Nelson(1 ep)
as Sheriff Velchik(1 ep)
as Anthony Franklin(1 ep)
as Ralph Christianson
as Tom Banacheck
as Reverend Bankerd(2 eps)
as Pete Burton(3 eps)
as Ron Cheals(6 eps)
as Congressman Wilcox(2 eps)
as Nolan(1 ep)
as Det. Yarbough(1 ep)
as Don Wheeler(1 ep)
as Herb Stanton(1 ep)
as Gary Clark(3 eps)
as Boyd Keene(1 ep)
as Cowboy
as Dr. Robert McLean(1 ep)
as Alonso Mathews(1 ep)
as Sheriff Smyth
as Riley McCallister(3 eps)
as Ralph
as Mr. Pollard
as Gen. Matheson
as Thomas Shannon(1 ep)
as Jerry Blackburn(1 ep)
as Richard Walsh(1 ep)
as Richard Welsh(1 ep)
as Chris Benz(1 ep)
as Lawyer Rodman
as O.B. Keeler
as Dr. Bernard Colbert(4 eps)
as Philip Evans(1 ep)
as Ron Butterfield(15 eps)
as ATF Asst. Director Ben Walker
as Greene
as Mr. Lusk
as Cult Leader (Voice)
as Dr. Colbert(1 ep)
as Daniel Edwards (uncredited)(1 ep)
as Judge Robert Temple(1 ep)
as County Prosecutor Calvin Smith(1 ep)
as Agent Moreland
as Commander Bradley(1 ep)
as Jon Jordan
as Detective Brickman
as Ray Pasquerello
as Col. Ken Kilner(1 ep)
as Bill Wyzinski(1 ep)
as Spencer Heymen
as Dick Britton
as Sheriff Buck O'Hara(1 ep)
as Patrol Captain Van Gelder(1 ep)
as Clark Thompson
as School Psychologist
as Serato
as Jergens
as Michael
as Raymond Brown
as Churchill