Mark O'Brien
Canadian actor and filmmaker identified with auteur and genre cinema. He came to prominence with roles in Denis Villeneuve's 'Arrival' (2016), 'Bad Times at the El Royale' (2018) and the acclaimed horror film 'Ready or Not' (2019). He starred in Noah Baumbach's 'Marriage Story' (2019) and the series 'Halt and Catch Fire'. Canadian actor recognized for his versatility and his range of varied characters, with an established presence as a supporting player in contemporary prestige film and television productions, as well as a directing side.
Mark O'Brien
31 Movies
12 Series
Canadian actor and filmmaker identified with auteur and genre cinema. He came to prominence with roles in Denis Villeneuve's 'Arrival' (2016), 'Bad Times at the El Royale' (2018) and the acclaimed horror film 'Ready or Not' (2019). He starred in Noah Baumbach's 'Marriage Story' (2019) and the series 'Halt and Catch Fire'. Canadian actor recognized for his versatility and his range of varied characters, with an established presence as a supporting player in contemporary prestige film and television productions, as well as a directing side.
Movies
Plays Captain Marks
Arrival
2016
Plays Alex
Ready or Not
2019
Plays Colonel John Amen
Nuremberg
2025
Plays Carter Mitchum
Marriage Story
2019
Plays Larsen Rogers
Bad Times at the El Royale
2018
Plays Rob Meadows
The Darkest Minds
2018
Plays Jake
Kin
2018
Plays Ace
Blue Bayou
2021
Plays Jeremiah
How It Ends
2018
Plays Cyrus Frear
Anon
2018
Plays Paul
Seven Veils
2025
Plays Billy Shore
The Front Runner
2018
Plays Daniel Ashford
The Outer Threat
2026
Plays Bruce Buck
How to Plan an Orgy in a Small Town
2015
Plays Josh
Parallel
2018
Plays Mason Harper
Shadow of God
2025
Plays Michael
Beat Down
2012
Plays Elizeus Carrier
The Memory Keeper
2025
Plays Darren
State Like Sleep
2019
Plays Mark
The Dark Stranger
2016
Plays Chris Davis
Hammer
2019
Plays Jason
End of Days, Inc.
2015
Plays Topper
Topper
2025
Producer
Plays Terry Sawchuk
Goalie
2019
Director
Plays Aaron Smith
The Righteous
2021
Plays Will
Grown Up Movie Star
2010
Plays Eric Rollins
The Four Horsemen
2008
TV Shows
Plays Des Courtney
Republic of Doyle
2010
Plays Tom Rendon
Halt and Catch Fire
2014
Plays Jimmy Ryan
City on a Hill
2019
Plays Max Miner
The Last Tycoon
2017
Plays Edmund Cobb
The Copenhagen Test
2025
Plays Officer Logan
61st Street
2022
Plays Thomas Milligan
Perry Mason
2020
Plays Father Jay
Your Honor
2020
Plays Randall Tier
Hannibal
2013
Plays Charlie
The Sticky
2024
Plays Grayson Hicks
Killjoys
2015
Plays Jerry Hoffler
Warehouse 13
2009
Latest Trailers
Watch Trailer
The Outer Threat
Full Filmography
The Outer Threat
Daniel Ashford
2026
Film
The Copenhagen Test
Edmund Cobb · 8 episodes
2025–
TV
Nuremberg
Colonel John Amen
2025
Film
The Memory Keeper
Elizeus Carrier
2025
Film
Shadow of God
Mason Harper
2025
Film
Seven Veils
Paul
2025
Film
Topper
Topper
2025
Film
The Sticky
Charlie · 1 episode
2024–
TV
61st Street
Officer Logan · 8 episodes
2022–
TV
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 31 movies and 12 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 Outer Threat, which premiered on July 24, 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).