Mark O'Brien
Department: 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).
Known For
Seven Veils
2025
The Four Horsemen
2008
Grown Up Movie Star
2010
Cut from the Same Cloth
2009
Heartless Disappearance Into Labrador Seas
2008
Shadow of God
2025
Snarbuckled
2010
The Dark Stranger
2016
Nuremberg
2025
End of Days, Inc.
2015
The Voices of Our Mother
—
Beat Down
2012
Arrival
2016
Anon
2018
State Like Sleep
2019
Kin
2018
Parallel
2018
The Darkest Minds
2018
How to Plan an Orgy in a Small Town
2015
Bad Times at the El Royale
2018
Marriage Story
2019
The Front Runner
2018
How It Ends
2018
Goalie
2019
Hammer
2019
Ready or Not
2019
Blue Bayou
2021
The Righteous
2021
Mum's the Word
2009
Epilogue
2008
Brad
2010
The Outer Threat
—
Dennis
2015
Falsehood
2025
Quiet at Dawn
2009
Topper
2025
The One That Got Away
2008
Better People
—
Sweetieface
2013
Wanderer
2016
Nice People
—
Perry Mason
2020
Republic of Doyle
2010
The Last Tycoon
2017
61st Street
2022
Killjoys
2015
The Kelly Clarkson Show
2019
City on a Hill
2019
Hannibal
2013
Warehouse 13
2009
Halt and Catch Fire
2014
Your Honor
2020
The Copenhagen Test
2025
The Sticky
2024