Mark O'Brien
Known for: Acting
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
Series
The Kelly Clarkson Show
Self
2019
Series
Hannibal
Randall Tier
2013
Series
Warehouse 13
Jerry Hoffler
2009
Film
Ready or Not
Alex
2019
Film
Arrival
Captain Marks
2016
Series
Perry Mason
Thomas Milligan
2020
Series
Halt and Catch Fire
Tom Rendon
2014
Film
Nuremberg
Colonel John Amen
2025
Series
Your Honor
Father Jay
2020
Series
The Copenhagen Test
Edmund Cobb
2025
Series
Republic of Doyle
Des Courtney
2010
Series
Killjoys
Grayson Hicks
2015
Series
City on a Hill
Jimmy Ryan
2019
Film
Marriage Story
Carter Mitchum
2019
Film
The Darkest Minds
Rob Meadows
2018
Film
Bad Times at the El Royale
Larsen Rogers
2018
Film
How It Ends
Jeremiah
2018
Series
The Sticky
Charlie
2024
Series
61st Street
Officer Logan
2022
Series
The Last Tycoon
Max Miner
2017
Film
The Outer Threat
Daniel Ashford
2026
Film
Parallel
Josh
2018
Film
Anon
Cyrus Frear
2018
Film
Kin
Jake
2018
Film
Blue Bayou
Ace
2021
Film
The Front Runner
Billy Shore
2018
Film
The Memory Keeper
Elizeus Carrier
2025
Film
Seven Veils
Paul
2025
Film
How to Plan an Orgy in a Small Town
Bruce Buck
2015
Film
Shadow of God
Mason Harper
2025
Better People
John
Film
The Voices of Our Mother
William
2026
Film
The Four Horsemen
Eric Rollins
2008
Film
Hammer
Chris Davis
2019
Brad
Brad
2010
Film
Beat Down
Michael
2012
Film
State Like Sleep
Darren
2019
Film
The Dark Stranger
Mark
2016
Good in the Room
Charlie
Film
Little One
Film
Goalie
Terry Sawchuk
2019
Epilogue
Henry
2008
Film
Dennis
Dennis
2015
Film
The One That Got Away
Tommy Palchek
2008
Film
The Righteous
Aaron Smith
2021
Film
Wanderer
Eric
2016
Film
Topper
Topper
2025
Quiet at Dawn
Watts
2009
Film
End of Days, Inc.
Jason
2015
Nice People
Film
Grown Up Movie Star
Will
2010
Film
Heartless Disappearance Into Labrador Seas
Charlie
2008
Cut from the Same Cloth
Jack Cochrane
2009
Mum's the Word
Curtis
2009
Film
Snarbuckled
Jacob O'Higgins
2010
Sweetieface
Sam
2013