Mark O'Brien
🎂 May 7, 1984 (42)
St. Johns, Newfoundland, Canada
Working since the 2000s, Mark O'Brien is an actor from St. Johns, Newfoundland, Canada. They are internationally recognised for roles such as Captain Marks in Arrival, Carter Mitchum in Marriage Story and Alex in Ready or Not. Other notable titles in their filmography include Marriage Story and Ready or Not. Over more than 18 years they have gathered close to 43 films and 13 TV productions, working mainly across genres like drama, sci-fi, mystery.
42Age
30Movies
12Series
42
Age
30
Movies
12
Series
Movies
Ready or Not
2019
Nuremberg
2025
Arrival
2016
Bad Times at the El Royale
2018
Marriage Story
2019
The Darkest Minds
2018
Anon
2018
How It Ends
2018
Parallel
2018
Kin
2018
The Front Runner
2018
Shadow of God
2025
How to Plan an Orgy in a Small Town
2015
Seven Veils
2025
Goalie
2019
Blue Bayou
2021
State Like Sleep
2019
The Four Horsemen
2008
Hammer
2019
Grown Up Movie Star
2010
The Righteous
2021
The Dark Stranger
2016
Topper
2025
End of Days, Inc.
2015
Latest Trailers
Watch Trailer
Nuremberg
Full Filmography
Photos
Frequently Asked Questions
How old is Mark O'Brien and where are they from?
Mark O'Brien is 42 years old, born on May 7, 1984 in St. Johns, Newfoundland, Canada.
What are the most famous roles of Mark O'Brien?
Mark O'Brien is best known for roles in Arrival, Marriage Story, Ready or Not.
How many movies has Mark O'Brien been in?
Over a 18-year career (since 2008), Mark O'Brien has appeared in 38 movies and 13 TV shows.
What was Mark O'Brien's first movie?
The career of Mark O'Brien began with The Four Horsemen (2008).
What is Mark O'Brien's most recent movie or series?
Mark O'Brien's most recent release is The Voices of Our Mother, which premiered on June 5, 2026.
What TV shows has Mark O'Brien appeared in?
On television, Mark O'Brien has appeared in Hannibal, Your Honor, Warehouse 13, Halt and Catch Fire.
Mark O'Brien
1984-05-07 · St. Johns, Newfoundland, Canada
Mark O'Brien (born May 7th, 1984) is a Canadian actor and director. He is best known for playing the role of Des Courtney in Republic of Doyle (2010) and Tom Rendon in Halt and Catch Fire (2014).