Mark O'Brien
Acting·May 7, 1984 — 42 years old· St. Johns, Newfoundland, Canada
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
Filmography · 58
—Better PeopleJohn · Director · Writer · Editor—Nice PeopleDirector—Good in the RoomCharlie · Writer · Executive Producer—Little One2026The Outer Threat2026The Voices of Our MotherWilliam · Director · Writer2025The Copenhagen TestTVEdmund Cobb2025NurembergColonel John Amen2025The Memory KeeperElizeus Carrier2025Shadow of GodMason Harper2025Seven VeilsPaul2025TopperTopper2024The StickyTVCharlie202261st StreetTVOfficer Logan2021Blue BayouAce2021The RighteousAaron Smith · Executive Producer · Director · Writer2020Your HonorTVFather Jay2020Perry MasonTVThomas Milligan2019HammerChris Davis2019Marriage StoryCarter Mitchum2019The Kelly Clarkson ShowTVSelf2019Ready or NotAlex2019City on a HillTVJimmy Ryan2019GoalieTerry Sawchuk · Executive Producer2019State Like SleepDarren2018The Front RunnerBilly Shore2018Bad Times at the El RoyaleLarsen Rogers2018KinJake2018The Darkest MindsRob Meadows2018How It EndsJeremiah2018AnonCyrus Frear2018ParallelJosh2017The Last TycoonTVMax Miner2016ArrivalCaptain Marks2016WandererEric · Director · Producer2016The Dark StrangerMark2015How to Plan an Orgy in a Small TownBruce Buck2015KilljoysTVGrayson Hicks2015End of Days, Inc.Jason2015DennisDennis · Producer2014Halt and Catch FireTVTom Rendon2013HannibalTVRandall Tier2013SweetiefaceSam · Director · Producer · Editor2012Beat DownMichael2011KathyDirector2010SnarbuckledJacob O'Higgins2010BradBrad · Producer · Editor2010Grown Up Movie StarWill2010Republic of DoyleTVDes Courtney2009Mum's the WordCurtis2009Quiet at DawnWatts2009Warehouse 13TVJerry Hoffler2009Cut from the Same ClothJack Cochrane2008Heartless Disappearance Into Labrador SeasCharlie2008EpilogueHenry2008Pretty GirlsDirector · Writer · Editor · Cinematography2008The One That Got AwayTommy Palchek2008The Four HorsemenEric Rollins