TV
The West Wing
He plays Secret Service agent Ron Butterfield.
FLM.REDMICHAEL
O’NEILL
ไมเคิล โอนีล
A character actor across film and television
Michael O’Neill is an American actor known for The West Wing, Dallas Buyers Club and Grey’s Anatomy.
Characters who carry authority
O’Neill’s work spans film and television, often in roles connected to institutions and public service. The Encyclopedia of Alabama describes a career that includes law-enforcement, military and medical characters.
In The West Wing he played Secret Service agent Ron Butterfield. His television work also includes a notable appearance in Grey’s Anatomy, while in Dallas Buyers Club (2013) he played FDA agent Richard Barkley.
O’Neill appears as Secretary of Defense Walter Crystal in War of the Worlds (2025), adding a science-fiction setting to a career across many kinds of drama.
The films below are those available on FLM.RED, not his complete filmography.
Selected performances
2013
Dallas Buyers Club
He plays FDA agent Richard Barkley.
2025
War of the Worlds
He plays Walter Crystal.
Performance readings are FLM.RED editorial interpretation.
Films in FLM.RED
Titles in this collection; not a complete filmography.
Sources & image notes
Portrait illustration: FLM.RED.