Michael O'Neill
Acting
Born May 29, 1947 · Montgomery, Alabama, USA
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 wido…
Known For · 40 titles
The Mentalist
Grey's Anatomy
NCIS
Criminal Minds
S.W.A.T.
CSI: Miami
Prison Break
ER
NCIS: Los Angeles
24
The X-Files
The West Wing
Tracker
Ghost Whisperer
JAG
Without a Trace
Chicago Hope
Rizzoli & Isles
Fringe
War of the Worlds
Sons of Anarchy
This Is Us
The Resident
Tom Clancy's Jack Ryan
Diagnosis: Murder
Army Wives
Crossing Jordan
Scandal
Boston Legal
Numb3rs
The Practice
Fire Country
Boston Public
The Unit
Close to Home
Roswell
Bates Motel
Leverage
Millennium
The Glades