Acting credits
49
Established
Large and steady acting portfolio.
Actor
Mark O'Brien
Acting
Career Snapshot
ExplainedThese indicators come from TMDB. They are relative signals, not review ratings.
TMDB popularity
1.6
Low visibility
TMDB internal trend index. Higher usually means more searches and page activity now.
Movies: 37Series: 13Crew credits: 6
TMDB ID: 225411
IMDb ID: nm1975628
Known for: Acting
Born: May 7, 1984
Age: 42
Place of birth: St. Johns, Newfoundland, Canada
Gender: Male
Adult content flag: No
Career span: 2008 - 2026
Years active: 19
Average TMDB rating: 6.58
Wikidata: Q15867224
Other jobs
Director (4)Executive Producer (1)Producer (1)
Biography
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).
Photos
Movies
Movies
Movie credits linked with Mark O'Brien.
The Outer Threat
as Daniel Ashford
2026 Movie
The Voices of Our Mother
as William
2026 Movie
Nuremberg
as Colonel John Amen
2025 Movie
The Memory Keeper
as Elizeus Carrier
2025 Movie
Shadow of God
as Mason Harper
2025 Movie
Seven Veils
as Paul
2025 Movie
Topper
as Topper
2025 Movie
Blue Bayou
as Ace
2021 Movie
The Righteous
as Aaron Smith
2021 Movie
Hammer
as Chris Davis
2019 Movie
Marriage Story
as Carter Mitchum
2019 Movie
Ready or Not
as Alex
2019 Movie
Goalie
as Terry Sawchuk
2019 Movie
State Like Sleep
as Darren
2019 Movie
The Front Runner
as Billy Shore
2018 Movie
Bad Times at the El Royale
as Larsen Rogers
2018 Movie
Kin
as Jake
2018 Movie
The Darkest Minds
as Rob Meadows
2018 Movie
How It Ends
as Jeremiah
2018 Movie
Anon
as Cyrus Frear
2018 Movie
Parallel
as Josh
2018 Movie
Arrival
as Captain Marks
2016 Movie
Wanderer
as Eric
2016 Movie
The Dark Stranger
as Mark
2016 Movie
Series
Series
Series credits linked with Mark O'Brien.
The Copenhagen Test
as Edmund Cobb • 8 eps
2025 Series
The Sticky
as Charlie • 1 eps
2024 Series
61st Street
as Officer Logan • 8 eps
2022 Series
Your Honor
as Father Jay • 3 eps
2020 Series
Perry Mason
as Thomas Milligan • 7 eps
2020 Series
The Kelly Clarkson Show
as Self • 1 eps
2019 Series
City on a Hill
as Jimmy Ryan • 14 eps
2019 Series
The Last Tycoon
as Max Miner • 9 eps
2017 Series
Killjoys
as Grayson Hicks • 1 eps
2015 Series
Halt and Catch Fire
as Tom Rendon • 15 eps
2014 Series
Hannibal
as Randall Tier • 2 eps
2013 Series
Republic of Doyle
as Des Courtney • 77 eps
2010 Series
Warehouse 13
as Jerry Hoffler • 1 eps
2009 Series