Mark O'Brien
Acting
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
tv
6.4
2019
The Kelly Clarkson Show
2019 · tv
tv
8.3
2013
Hannibal
2013 · tv
tv
7.7
2009
Warehouse 13
2009 · tv
movie
7.5
2025
Nuremberg
2025 · movie
movie
7.1
2019
Ready or Not
2019 · movie
movie
7.6
2016
Arrival
2016 · movie
tv
7.0
2010
Republic of Doyle
2010 · tv
tv
7.9
2014
Halt and Catch Fire
2014 · tv
tv
7.2
2020
Perry Mason
2020 · tv
tv
6.9
2015
Killjoys
2015 · tv
tv
8.1
2020
Your Honor
2020 · tv
tv
7.3
2019
City on a Hill
2019 · tv
tv
6.5
2025
The Copenhagen Test
2025 · tv
movie
7.7
2019
Marriage Story
2019 · movie
movie
6.8
2018
Bad Times at the El Royale
2018 · movie
tv
7.0
2017
The Last Tycoon
2017 · tv
movie
6.0
2018
Anon
2018 · movie
tv
6.9
2022
61st Street
2022 · tv
tv
7.2
2024
The Sticky
2024 · tv
movie
7.0
2018
The Darkest Minds
2018 · movie
movie
5.3
2018
How It Ends
2018 · movie
movie
5.9
2018
The Front Runner
2018 · movie
movie
5.6
2025
Seven Veils
2025 · movie
movie
6.1
2018
Kin
2018 · movie
movie
6.9
2019
Goalie
2019 · movie
movie
6.0
2018
Parallel
2018 · movie
movie
7.4
2021
Blue Bayou
2021 · movie
movie
5.1
2015
How to Plan an Orgy in a Small Town
2015 · movie
movie
5.7
2025
Shadow of God
2025 · movie
movie
2025
The Memory Keeper
2025 · movie