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).
Filmography 58
Movies (45)
The Outer Threat2026Daniel Ashford
The Voices of Our Mother2026William
Nuremberg2025Colonel John Amen
The Memory Keeper2025Elizeus Carrier
Shadow of God2025Mason Harper
Seven Veils2025Paul
Topper2025Topper
Blue Bayou2021Ace
The Righteous2021Aaron Smith
Hammer2019Chris Davis
Marriage Story2019Carter Mitchum
Ready or Not2019Alex
Goalie2019Terry Sawchuk
State Like Sleep2019Darren
The Front Runner2018Billy Shore
Bad Times at the El Royale2018Larsen Rogers
Kin2018Jake
The Darkest Minds2018Rob Meadows
How It Ends2018Jeremiah
Anon2018Cyrus Frear
Parallel2018Josh
Arrival2016Captain Marks
Wanderer2016Eric
The Dark Stranger2016Mark
How to Plan an Orgy in a Small Town2015Bruce Buck
End of Days, Inc.2015Jason
Dennis2015Dennis- Sweetieface2013Sam
Beat Down2012Michael
Kathy2011Directing
Shows (13)
The Copenhagen Test2025Edmund Cobb
The Sticky2024Charlie
61st Street2022Officer Logan
Your Honor2020Father Jay
Perry Mason2020Thomas Milligan
The Kelly Clarkson Show2019Self
City on a Hill2019Jimmy Ryan
The Last Tycoon2017Max Miner
Killjoys2015Grayson Hicks
Halt and Catch Fire2014Tom Rendon
Hannibal2013Randall Tier
Republic of Doyle2010Des Courtney
Warehouse 132009Jerry Hoffler