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
7.1
Ready or Not
2019 · Movie
7.5
Nuremberg
2025 · Movie
7.6
Arrival
2016 · Movie
7.7
Marriage Story
2019 · Movie
6.8
Bad Times at the El Royale
2018 · Movie
7.0
The Darkest Minds
2018 · Movie
6.1
Kin
2018 · Movie
7.4
Blue Bayou
2021 · Movie
6.0
Anon
2018 · Movie
5.3
How It Ends
2018 · Movie
5.6
Seven Veils
2025 · Movie
5.9
The Front Runner
2018 · Movie
6.0
Parallel
2018 · Movie
7.0
Goalie
2019 · Movie
5.7
Shadow of God
2025 · Movie
5.4
Hammer
2019 · Movie
5.1
How to Plan an Orgy in a Small Town
2015 · Movie
6.2
The Righteous
2021 · Movie
5.3
Topper
2025 · Movie
5.7
End of Days, Inc.
2015 · Movie
4.9
The Dark Stranger
2016 · Movie
5.1
Grown Up Movie Star
2010 · Movie
4.7
State Like Sleep
2019 · Movie
4.3
The One That Got Away
2008 · Movie
3.8
The Four Horsemen
2008 · Movie
Heartless Disappearance Into Labrador Seas
2008 · Movie
Coming Soon
The Voices of Our Mother
Releases Jun 5, 2026
The Memory Keeper
2025 · Movie
Beat Down
2012 · Movie
Dennis
2015 · Movie
Snarbuckled
2010 · Movie
Wanderer
2016 · Movie