Mark O'Brien
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
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Filmography
Acting (55)
Movies (41)
Nuremberg
2025as Colonel John Amen
Shadow of God
2025as Mason Harper
Seven Veils
2025as Paul
Falsehood
2025as Elizeus Carrier
Topper
2025as Topper
The Righteous
2021as Aaron Smith
Blue Bayou
2021as Ace
Ready or Not
2019as Alex Le Domas
Marriage Story
2019as Carter Mitchum
Goalie
2019as Terry Sawchuk
State Like Sleep
2019as Darren
Hammer
2019as Chris Davis
Anon
2018as Cyrus Frear
Bad Times at the El Royale
2018as Larsen Rogers
The Darkest Minds
2018as Rob Meadows
Kin
2018as Jake
How It Ends
2018as Jeremiah
The Front Runner
2018as Billy Shore
Parallel
2018as Josh
Arrival
2016as Captain Marks
The Dark Stranger
2016as Mark
Wanderer
2016as Eric
How to Plan an Orgy in a Small Town
2015as Bruce Buck
Dennis
2015as Dennis
End of Days, Inc.
2015as Jason
Sweetieface
2013as Sam
Beat Down
2012as Michael
Snarbuckled
2010as Jacob O'Higgins
Brad
2010as Brad
Grown Up Movie Star
2010as Will
Quiet at Dawn
2009as Watts
Mum's the Word
2009as Curtis
Cut from the Same Cloth
2009as Jack Cochrane
The Four Horsemen
2008as Eric Rollins
Heartless Disappearance Into Labrador Seas
2008as Charlie
Epilogue
2008as Henry
The One That Got Away
2008as Tommy Palchek
The Voices of Our Mother
as William
The Outer Threat
Nice People
Better People
as John
Television (14)
The Copenhagen Test
2025as Edmund Cobb
The Sticky
2024as Charlie
61st Street
2022as Officer Logan
Perry Mason
2020as Thomas Milligan
Your Honor
2020as Father Jay
The Kelly Clarkson Show
2019as Self
City on a Hill
2019as Jimmy Ryan
City on a Hill
2019as Jimmy Ryan
The Last Tycoon
2017as Max Miner
Killjoys
2015as Grayson Hicks
Halt and Catch Fire
2014as Tom Rendon
Hannibal
2013as Randall Tier
Republic of Doyle
2010as Des Courtney
Warehouse 13
2009as Jerry Hoffler
Crew (23)
Movies (23)
The Righteous
2021Director
The Righteous
2021Executive Producer
The Righteous
2021Writer
Goalie
2019Executive Producer
Wanderer
2016Director
Wanderer
2016Producer
Dennis
2015Producer
Sweetieface
2013Director
Sweetieface
2013Editor
Sweetieface
2013Producer
Kathy
2011Director
Brad
2010Editor
Brad
2010Producer
Pretty Girls
2008Cinematography
Pretty Girls
2008Director
Pretty Girls
2008Editor
Pretty Girls
2008Writer
The Voices of Our Mother
Director
The Voices of Our Mother
Writer
Nice People
Director
Better People
Director
Better People
Editor
Better People
Writer
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