Michael O'Neill

Born: 1947-05-29

​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.


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Criminal Minds

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as Ron Butterfield
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as Lonnie Mencken
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Chicago Hope

as uncredited
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The Glades

as Trent Staley
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FlashForward

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The Unit

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Manhattan

as Psychiatrist
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Set against the backdrop of the greatest clandestine race against time in the history of science...

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The Romanoffs

as Ron Hopkins
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The Shining

as Daniel Edwards (uncredited)
First aired: 1997-04-27

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One West Waikiki

as uncredited
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One West Waikiki is an American crime/drama TV show set in Hawaii which ran from 1994-1996. It...

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as Victor McCleary
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The Nine

as Pete Burton
First aired: 2006-10-04

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