Acting

89

Man

29 May 1947 (77)

Montgomery, Alabama, USA

—

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.

Transformers

27 June 2007

Grey's Anatomy

27 March 2005

Dallas Buyers Club

1 November 2013

Prison Break

29 August 2005

The Mentalist

23 September 2008

Criminal Minds

22 September 2005

The X-Files

10 September 1993

Sons of Anarchy

3 September 2008

Fringe

9 September 2008

J. Edgar

9 November 2011