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Michael O'Neill
Known for: 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.
Filmography 31
War of the Worlds
as Secretary of Defense Walter Crystal 
Air
+4
as Joe Dean 
Echoes
as Victor McCleary 
Dallas Buyers Club
+12
as Richard Barkley 
Secondhand Lions
+1
as Ralph 
Bride Hard
+2
as Frank 
Green Zone
+3
as Colonel Bethel 
Sea of Love
as Raymond Brown 
Dreamcatcher
+3
as Gen. Matheson 
Blind Justice
as Spencer Heymen 
Transformers
+5
as Tom Banacheck 
Seabiscuit
+2
as Mr. Pollard 
Indivisible
+1
as Chaplain Rogers 
Danger One
+1
as Beckwith 
Ghost Story
+2
as Churchill 
Flying Lessons
as Chief Dobbs 
The Legend of Bagger Vance
+5
as O.B. Keeler 
Nothing But the Truth
+4
as CIA Director 
Jennifer Eight
+2
as Serato 
The Mod Squad
+3
as Greene 
Bushwhacked
as Jon Jordan 
The Sunchaser
+2
as Agent Moreland 
Around the Bend
+2
as Cowboy 
Clemency
+1
as Chaplain David Kendricks 
Dancer, Texas Pop. 81
+1
as Mr. Lusk 
For Their Own Good
as Clark Thompson 
Victim of Love: The Shannon Mohr Story
as Dick Britton 
American Crime
as Sheriff Smyth 
Standoff
as Cult Leader (Voice) 
The Grim Sleeper
as Detective Simms 
On Yoga: The Architecture of Peace
Producer