Acting credits
44
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
0.8
Low visibility
TMDB internal trend index. Higher usually means more searches and page activity now.
Movies: 32Series: 13Crew credits: 5
TMDB ID: 225411
IMDb ID: nm1975628
Known for: Acting
Born: May 7, 1984
Age: 41
Place of birth: St. Johns, Newfoundland, Canada
Gender: Male
Adult content flag: No
Career span: 2008 - 2025
Years active: 18
Average TMDB rating: 6.63
Wikidata: Q15867224
Also known as
Mark O’Brien
Other jobs
Director (3)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.
7.4
Nuremberg
as Colonel John Amen
2025 Movie
Falsehood
as Elizeus Carrier
2025 Movie
5.7
Shadow of God
as Mason Harper
2025 Movie
5.6
Seven Veils
as Paul
2025 Movie
5.3
Topper
as Topper
2025 Movie
7.5
Blue Bayou
as Ace
2021 Movie
6.2
The Righteous
as Aaron Smith
2021 Movie
5.4
Hammer
as Chris Davis
2019 Movie
7.7
Marriage Story
as Carter Mitchum
2019 Movie
7.0
Ready or Not
as Alex Le Domas
2019 Movie
7.0
Goalie
as Terry Sawchuk
2019 Movie
4.7
State Like Sleep
as Darren
2019 Movie
5.9
The Front Runner
as Billy Shore
2018 Movie
6.8
Bad Times at the El Royale
as Larsen Rogers
2018 Movie
6.1
Kin
as Jake
2018 Movie
7.0
The Darkest Minds
as Rob Meadows
2018 Movie
5.3
How It Ends
as Jeremiah
2018 Movie
6.0
Anon
as Cyrus Frear
2018 Movie
6.0
Parallel
as Josh
2018 Movie
7.6
Arrival
as Captain Marks
2016 Movie
Wanderer
as Eric
2016 Movie
4.9
The Dark Stranger
as Mark
2016 Movie
5.1
How to Plan an Orgy in a Small Town
as Bruce Buck
2015 Movie
5.6
End of Days, Inc.
as Jason
2015 Movie
Series
Series
Series credits linked with Mark O'Brien.
6.4
The Copenhagen Test
as Edmund Cobb • 8 eps
2025 Series
7.2
The Sticky
as Charlie • 1 eps
2024 Series
6.9
61st Street
as Officer Logan • 8 eps
2022 Series
8.1
Your Honor
as Father Jay • 3 eps
2020 Series
7.2
Perry Mason
as Thomas Milligan • 7 eps
2020 Series
6.4
The Kelly Clarkson Show
as Self • 1 eps
2019 Series
7.2
City on a Hill
as Jimmy Ryan • 14 eps
2019 Series
7.0
The Last Tycoon
as Max Miner • 9 eps
2017 Series
6.9
Killjoys
as Grayson Hicks • 1 eps
2015 Series
7.9
Halt and Catch Fire
as Tom Rendon • 15 eps
2014 Series
8.3
Hannibal
as Randall Tier • 2 eps
2013 Series
7.0
Republic of Doyle
as Des Courtney • 77 eps
2010 Series
7.7
Warehouse 13
as Jerry Hoffler • 1 eps
2009 Series