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).
2026The Outer ThreatMovieas Daniel Ashford
2026The Voices of Our MotherMovieas William · Director · Writer
2025The Copenhagen TestTV showas Edmund Cobb · 8 episodes2025NurembergMovieas Colonel John Amen
2025The Memory KeeperMovieas Elizeus Carrier
2025Shadow of GodMovieas Mason Harper
2025Seven VeilsMovieas Paul
2025TopperMovieas Topper
2024The StickyTV showas Charlie · 1 episodes
202261st StreetTV showas Officer Logan · 8 episodes2021Blue BayouMovieas Ace
2021The RighteousMovieas Aaron Smith · Writer · Director · Executive Producer2020Your HonorTV showas Father Jay · 3 episodes2020Perry MasonTV showas Thomas Milligan · 7 episodes
2019HammerMovieas Chris Davis2019Marriage StoryMovieas Carter Mitchum
2019The Kelly Clarkson ShowTV showas Self · 1 episodes2019Ready or NotMovieas Alex2019City on a HillTV showas Jimmy Ryan · 14 episodes
2019GoalieMovieas Terry Sawchuk · Executive Producer
2019State Like SleepMovieas Darren2018The Front RunnerMovieas Billy Shore2018Bad Times at the El RoyaleMovieas Larsen Rogers2018KinMovieas Jake2018The Darkest MindsMovieas Rob Meadows2018How It EndsMovieas Jeremiah2018AnonMovieas Cyrus Frear2018ParallelMovieas Josh
2017The Last TycoonTV showas Max Miner · 9 episodes2016ArrivalMovieas Captain Marks
2016WandererMovieas Eric · Director · Producer
2016The Dark StrangerMovieas Mark2015How to Plan an Orgy in a Small TownMovieas Bruce Buck2015KilljoysTV showas Grayson Hicks · 1 episodes
2015End of Days, Inc.Movieas Jason
2015DennisMovieas Dennis · Producer2014Halt and Catch FireTV showas Tom Rendon · 15 episodes2013HannibalTV showas Randall Tier · 2 episodes
2012Beat DownMovieas Michael
2011KathyMovieDirector
2010SnarbuckledMovieas Jacob O'Higgins
2010Grown Up Movie StarMovieas Will
2010Republic of DoyleTV showas Des Courtney · 77 episodes
2009Mum's the WordMovieas Curtis2009Warehouse 13TV showas Jerry Hoffler · 1 episodes
2009Cut from the Same ClothMovieas Jack Cochrane
2008Heartless Disappearance Into Labrador SeasMovieas Charlie
2008The One That Got AwayMovieas Tommy Palchek
2008The Four HorsemenMovieas Eric Rollins
—Little OneMovie