Actor
Michael O'Neill
May 29, 1947 · Montgomery, Alabama, USA
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.
Notable work
6.8Transformers (2007)
as Tom Banacheck
8.2Grey's Anatomy (2005)
as Gary Clark
7.9Dallas Buyers Club (2013)
as Richard Barkley
8.1Prison Break (2005)
as Herb Stanton
8.4The Mentalist (2008)
as Sheriff Nelson
8.3Criminal Minds (2005)
as Det. Yarbough
8.4The X-Files (1993)
as Patrol Captain Van Gelder
8.4Sons of Anarchy (2008)
as Anthony Franklin
8.1Fringe (2008)
as Sheriff Velchik
6.2J. Edgar (2011)
as Senator McKellar
7.6NCIS (2003)
as Riley McCallister
7.1Traffic (2000)
as Lawyer Rodman
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