Known For
Acting
Gender
Male
Birthday
May 7, 1984
Age
42
Place of Birth
St. Johns, Newfoundland, Canada
Popularity
1.4
Mark O'Brien
Acting
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).
Latest News
Known For
6.3
The Kelly Clarkson Show
2019 · TV
8.3
Hannibal
2013 · TV
7.7
Warehouse 13
2009 · TV
7.6
Arrival
2016 · Movie
7.1
Ready or Not
2019 · Movie
7.2
Perry Mason
2020 · TV
7.6
Nuremberg
2025 · Movie
7.9
Halt and Catch Fire
2014 · TV
6.9
Killjoys
2015 · TV
6.6
The Copenhagen Test
2025 · TV
7.0
Republic of Doyle
2010 · TV
8.1
Your Honor
2020 · TV
Filmography
2026
The Outer Threat
Movie · Daniel Ashford
5.8
2026
The Voices of Our Mother
Movie · William
6.4
2025
The Copenhagen Test
TV · Edmund Cobb
6.6
2025
Nuremberg
Movie · Colonel John Amen
7.6
2025
The Memory Keeper
Movie · Elizeus Carrier
0.0
2025
Shadow of God
Movie · Mason Harper
5.7
2025
Seven Veils
Movie · Paul
5.6
2025
Topper
Movie · Topper
5.3
2024
The Sticky
TV · Charlie
7.2
2022
61st Street
TV · Officer Logan
6.2
2021
Blue Bayou
Movie · Ace
7.4
2021
The Righteous
Movie · Aaron Smith
6.3
2020
Your Honor
TV · Father Jay
8.1
2020
Perry Mason
TV · Thomas Milligan
7.2
2019
Hammer
Movie · Chris Davis
5.4
2019
Marriage Story
Movie · Carter Mitchum
7.7
2019
The Kelly Clarkson Show
TV · Self
6.3
2019
Ready or Not
Movie · Alex
7.1
2019
City on a Hill
TV · Jimmy Ryan
7.3
2019
Goalie
Movie · Terry Sawchuk
6.8
2019
State Like Sleep
Movie · Darren
4.7
2018
The Front Runner
Movie · Billy Shore
5.9
2018
Bad Times at the El Royale
Movie · Larsen Rogers
6.8
2018
Kin
Movie · Jake
6.1