Michael O'Neill

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​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.

Gender
male
Date of Birth
()
Place of Birth
Montgomery, Alabama, USA

Credits

Cast

CharacterMovie / TV ShowGenresReleaseRating
Senator Mitchell ChapinTom Clancy's Jack RyanTV5 Episodes77% · 1,502
Carl LucaS.W.A.T.TV3 Episodes81% · 1,395
Ray BrooksShooterTV3 Episodes72% · 642
Jonathan McKnightRizzoli & IslesTV79% · 415
Colonel BethelGreen Zone65% · 2,143
Ret. U.S. Army General Richard CollinsNCIS: Los AngelesTV75% · 1,148
Judge RoyLeverageTV76% · 364
Sheriff NelsonThe MentalistTV84% · 3,763
Sheriff VelchikFringeTV81% · 2,448
Det. YarboughCriminal MindsTV83% · 3,719
Riley McCallisterNCISTV3 Episodes76% · 2,263
Chris BenzCrossing JordanTV72% · 142
Commander BradleyJAGTV73% · 344
Patrol Captain Van GelderThe X-FilesTV84% · 3,071
All credits on TMDb.org.