Biography
Mark O'Brien
Acting
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). In total, there are 56 recognized credits in film and television. On Cinestia you can browse Mark O'Brien's complete filmography — 43 films and 13 series — and find where to watch each title.
Career works
56
Movies
43
Series
13
Career average
6.3/10
Birth date
05/07/1984
Place of birth
St. Johns, Newfoundland, Canada
Filmography highlights
Movies
The Outer Threat
2026 · 4.0
The Voices of Our Mother
2026 · 5.8
Nuremberg
2025 · 7.6
The Memory Keeper
2025
Shadow of God
2025 · 5.7
Seven Veils
2025 · 5.7
Topper
2025 · 5.3
Blue Bayou
2021 · 7.4
The Righteous
2021 · 6.3
Hammer
2019 · 5.4
Marriage Story
2019 · 7.7
Ready or Not
2019 · 7.1
Goalie
2019 · 6.9
State Like Sleep
2019 · 4.7
The Front Runner
2018 · 5.9
Series
The Copenhagen Test
2025 · 6.5
The Sticky
2024 · 7.2
61st Street
2022 · 6.6
Your Honor
2020 · 8.1
Perry Mason
2020 · 7.2
The Kelly Clarkson Show
2019 · 6.3
City on a Hill
2019 · 7.3
The Last Tycoon
2017 · 7.0
Killjoys
2015 · 6.9
Halt and Catch Fire
2014 · 7.9
Hannibal
2013 · 8.3
Republic of Doyle
2010 · 7.0
Warehouse 13
2009 · 7.7