Mark O'Brien
Acting
Born: 1984-05-07 · St. Johns, Newfoundland, Canada
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).
🎬 Movies (20)
The Voices of Our Mother
2026
William
Nuremberg
2025
Colonel John Amen
The Memory Keeper
2025
Elizeus Carrier
Shadow of God
2025
Mason Harper
Seven Veils
2025
Paul
Topper
2025
Topper
Blue Bayou
2021
Ace
The Righteous
2021
Aaron Smith
Hammer
2019
Chris Davis
Marriage Story
2019
Carter Mitchum
Ready or Not
2019
Alex
Goalie
2019
Terry Sawchuk
State Like Sleep
2019
Darren
The Front Runner
2018
Billy Shore
Bad Times at the El Royale
2018
Larsen Rogers
Kin
2018
Jake
The Darkest Minds
2018
Rob Meadows
How It Ends
2018
Jeremiah
Anon
2018
Cyrus Frear
Parallel
2018
Josh
📺 TV Shows (13)
The Copenhagen Test
2025
Edmund Cobb
The Sticky
2024
Charlie
61st Street
2022
Officer Logan
Your Honor
2020
Father Jay
Perry Mason
2020
Thomas Milligan
The Kelly Clarkson Show
2019
Self
City on a Hill
2019
Jimmy Ryan
The Last Tycoon
2017
Max Miner
Killjoys
2015
Grayson Hicks
Halt and Catch Fire
2014
Tom Rendon
Hannibal
2013
Randall Tier
Republic of Doyle
2010
Des Courtney
Warehouse 13
2009
Jerry Hoffler