Mark O'Brien
Known for acting · Born 7 May 1984 · 42 · St. Johns, Newfoundland, Canada
69 credits
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
Ready or Not
2019
Arrival
2016
Republic of Doyle
2010
Halt and Catch Fire
2014
How It Ends
2018
Anon
2018
Blue Bayou
2021
City on a Hill
2019
Parallel
2018
The Front Runner
2018
Perry Mason
2020
The Darkest Minds
2018
Acting (57)
2026The Outer ThreatDaniel AshfordFilm
2026The Voices of Our MotherWilliamFilm
2025NurembergColonel John AmenFilm
2025The Copenhagen TestEdmund Cobb · 8 episodesSeries
2025Seven VeilsPaulFilm
2025Shadow of GodMason HarperFilm
2025TopperTopperFilm
2025The Memory KeeperElizeus CarrierFilm
2024The StickyCharlieSeries
202261st StreetOfficer Logan · 8 episodesSeries
2021Blue BayouAceFilm
2021The RighteousAaron SmithFilm
2020Your HonorFather Jay · 3 episodesSeries
2020Perry MasonThomas Milligan · 7 episodesSeries
2019Marriage StoryCarter MitchumFilm
2019Ready or NotAlexFilm
2019City on a HillJimmy Ryan · 14 episodesSeries
2019The Kelly Clarkson ShowSelfSeries
2019State Like SleepDarrenFilm
2019HammerChris DavisFilm
2019GoalieTerry SawchukFilm
2018Bad Times at the El RoyaleLarsen RogersFilm
2018The Darkest MindsRob MeadowsFilm
2018How It EndsJeremiahFilm
2018AnonCyrus FrearFilm
2018KinJakeFilm
2018The Front RunnerBilly ShoreFilm
2018ParallelJoshFilm
2017The Last TycoonMax Miner · 9 episodesSeries
2016ArrivalCaptain MarksFilm
2016The Dark StrangerMarkFilm
2016WandererEricFilm
2015KilljoysGrayson HicksSeries
2015How to Plan an Orgy in a Small TownBruce BuckFilm
2015End of Days, Inc.JasonFilm
2015DennisDennisFilm
2014Halt and Catch FireTom Rendon · 15 episodesSeries
2013HannibalRandall Tier · 2 episodesSeries
2013SweetiefaceSamFilm
2012Beat DownMichaelFilm
2010Republic of DoyleDes Courtney · 77 episodesSeries
2010Grown Up Movie StarWillFilm
2010SnarbuckledJacob O'HigginsFilm
2010BradBradFilm
2009Warehouse 13Jerry HofflerSeries
2009Cut from the Same ClothJack CochraneFilm
2009Mum's the WordCurtisFilm
2009Quiet at DawnWattsFilm
2008The Four HorsemenEric RollinsFilm
2008The One That Got AwayTommy PalchekFilm
2008Heartless Disappearance Into Labrador SeasCharlieFilm
2008EpilogueHenryFilm
—Better PeopleJohnFilm
—Nice PeopleFilm
—Good in the RoomCharlieFilm
—Little OneFilm
—SomaPaulFilm
Directing (7)
2026The Voices of Our MotherDirector, WriterFilm
2016WandererDirector, ProducerFilm
2013SweetiefaceDirector, Producer, EditorFilm
2011KathyDirectorFilm
2008Pretty GirlsDirector, Writer, Editor, CinematographyFilm
—Better PeopleDirector, Writer, EditorFilm
—Nice PeopleDirectorFilm
Production (3)
2019GoalieExecutive ProducerFilm
2015DennisProducerFilm
2010BradProducer, EditorFilm
Writing (2)
2021The RighteousWriter, Director, Executive ProducerFilm
—Good in the RoomWriter, Executive ProducerFilm