Mark O'Brien
Acting
Born 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).
Known for
7.7
Marriage Story
2019 · Movie
7.6
Arrival
2016 · Movie
7.6
Nuremberg
2025 · Movie
7.4
Blue Bayou
2021 · Movie
7.1
Ready or Not
2019 · Movie
7.0
The Darkest Minds
2018 · Movie
6.8
Bad Times at the El Royale
2018 · Movie
6.8
Goalie
2019 · Movie
6.3
The Righteous
2021 · Movie
6.1
Kin
2018 · Movie
6.4
The Voices of Our Mother
2026 · Movie
The Memory Keeper
2025 · Movie
Little One
— · Movie
Dennis
2015 · Movie
Beat Down
2012 · Movie
Wanderer
2016 · Movie
Heartless Disappearance Into Labrador Seas
2008 · Movie
Snarbuckled
2010 · Movie
6.0
Anon
2018 · Movie
6.0
Parallel
2018 · Movie
5.3
Topper
2025 · Movie
5.7
The Outer Threat
2026 · Movie
5.8
End of Days, Inc.
2015 · Movie
4.3
The One That Got Away
2008 · Movie
5.9
The Front Runner
2018 · Movie
5.7
Seven Veils
2025 · Movie
5.7
Shadow of God
2025 · Movie
5.1
Grown Up Movie Star
2010 · Movie
5.4
Hammer
2019 · Movie
5.1
The Four Horsemen
2008 · Movie
4.9
The Dark Stranger
2016 · Movie
4.7
State Like Sleep
2019 · Movie
5.1
How to Plan an Orgy in a Small Town
2015 · Movie
5.3
How It Ends
2018 · Movie