Michael O'Neill

Where to watch Michael O'Neill

• War of the WorldsMovie · 2025

Biography

​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.

Filmography

1. 2025War of the Worldsas Secretary of Defense Walter Crystal
2. 2025Bride Hardas Frank
3. 2024Trackeras Buck Avery · 1 episode
4. 2023Airas Joe Dean
5. 2022Fire Countryas Harlan Denbo · 1 episode
6. 2022Echoesas Victor McCleary · 7 episodes
7. 2022Outer Rangeas Judge Pettigrew · 2 episodes
8. 2020Messiahas Cameron Collier · 5 episodes
9. 2018Tom Clancy's Jack Ryanas Senator Mitchell Chapin · 5 episodes
10. 2018The Residentas Joshua Williams · 1 episode
11. 2017S.W.A.T.as Carl Luca · 3 episodes
12. 2016Shooteras Ray Brooks · 3 episodes
13. 2016This Is Usas Arlo · 1 episode
14. 201611.22.63as Arliss Price · 1 episode
15. 2014Extantas Alan Sparks · 13 episodes
16. 2013Dallas Buyers Clubas Richard Barkley
17. 2013Rectifyas Senator Roland Foulkes · 15 episodes
18. 2013Bates Motelas Nick Ford · 8 episodes
19. 2012Scandalas Lonnie Mencken · 5 episodes
20. 2011J. Edgaras Senator McKellar
21. 2010Rizzoli & Islesas Jonathan McKnight · 1 episode
22. 2010The Gladesas Trent Staley · 1 episode
23. 2010Green Zoneas Colonel Bethel
24. 2009FlashForwardas CIA Director Keller · 1 episode
25. 2009NCIS: Los Angelesas Ret. U.S. Army General Richard Collins · 1 episode
26. 2008Nothing But the Truthas CIA Director
27. 2008Leverageas Judge Roy · 1 episode
28. 2008The Mentalistas Sheriff Nelson · 1 episode
29. 2008Fringeas Sheriff Velchik · 1 episode
30. 2008Sons of Anarchyas Anthony Franklin · 1 episode
31. 2007Transformersas Tom Banacheck
32. 2006The Unitas Ron Cheals · 6 episodes
33. 2005Ghost Whispereras Nolan · 1 episode
34. 2005Criminal Mindsas Det. Yarbough · 1 episode
35. 2005Prison Breakas Herb Stanton · 1 episode
36. 2005Grey's Anatomyas Gary Clark · 3 episodes
37. 2005Numb3rsas Boyd Keene · 1 episode
38. 2004Boston Legalas Dr. Robert McLean · 1 episode
39. 2003NCISas Riley McCallister · 3 episodes
40. 2003Secondhand Lionsas Ralph
41. 2003Seabiscuitas Mr. Pollard
42. 2003Dreamcatcheras Gen. Matheson
43. 2002Without a Traceas Thomas Shannon · 1 episode
44. 2002CSI: Miamias Jerry Blackburn · 1 episode
45. 200124as Richard Walsh · 1 episode
46. 2001Crossing Jordanas Chris Benz · 1 episode
47. 2000Trafficas Lawyer Rodman
48. 2000The Legend of Bagger Vanceas O.B. Keeler
49. 1999Roswellas Philip Evans · 1 episode
50. 1999The West Wingas Ron Butterfield · 15 episodes
51. 1997Ally McBealas Dr. Colbert · 1 episode
52. 1997The Shiningas Daniel Edwards (uncredited) · 1 episode
53. 1996Millenniumas County Prosecutor Calvin Smith · 1 episode
54. 1995JAGas Commander Bradley · 1 episode
55. 1994ERas Col. Ken Kilner · 1 episode
56. 1993The X-Filesas Patrol Captain Van Gelder · 1 episode
57. 1992Lorenzo's Oilas School Psychologist
58. 1992Jennifer Eightas Serato
59. 1989Sea of Loveas Raymond Brown
60. 1981Ghost Storyas Churchill