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).
Gallery
Known For
Acting History
2025
The Copenhagen Test as Cobb
2025Nuremberg as Colonel John Amen
2025Falsehood as Elizeus Carrier
2025Shadow of God as Mason Harper
2025Seven Veils as Paul
2025Topper as Topper
2024The Sticky as Charlie
202261st Street as Officer Logan
2021Blue Bayou as Ace
2021The Righteous as Aaron Smith
2020Your Honor as Father Jay
2020Perry Mason as Thomas Milligan
2019Hammer as Chris Davis
2019Marriage Story as Carter Mitchum
2019The Kelly Clarkson Show as Self
2019Ready or Not as Alex Le Domas
2019City on a Hill as Jimmy Ryan
2019Goalie as Terry Sawchuk
2019State Like Sleep as Darren
2018The Front Runner as Billy Shore
2018Bad Times at the El Royale as Larsen Rogers
2018Kin as Jake
2018The Darkest Minds as Rob Meadows
2018How It Ends as Jeremiah
2018Anon as Cyrus Frear
2018Parallel as Josh
2017The Last Tycoon as Max Miner
2016Arrival as Captain Marks
2016Wanderer as Eric
2016The Dark Stranger as Mark
2015How to Plan an Orgy in a Small Town as Bruce Buck
2015Killjoys as Grayson Hicks
2015End of Days, Inc. as Jason
2015Dennis as Dennis
2014Halt and Catch Fire as Tom Rendon
2013Hannibal as Randall Tier
2013Sweetieface as Sam
2012Beat Down as Michael
2010Snarbuckled as Jacob O'Higgins
2010Brad as Brad
2010Republic of Doyle as Des Courtney
2009Mum's the Word as Curtis
2009Grown Up Movie Star as Will
2009Quiet at Dawn as Watts
2009Warehouse 13 as Jerry Hoffler
2009Cut from the Same Cloth as Jack Cochrane
2008Heartless Disappearance Into Labrador Seas as Charlie
2008Epilogue as Henry
2008The One That Got Away as Tommy Palchek
2008The Four Horsemen as Eric Rollins
—The Voices of Our Mother as William
—The Outer Threat
—Nice People
—Better People as John