Acting
Mark O'Brien
Born May 7, 1984 · St. Johns, Newfoundland, Canada
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
7.6 TMDB
Arrival
Captain Marks
7.9
Marriage Story
Carter Mitchum
7.1 TMDB
Ready or Not
Alex
6.8 TMDB
Bad Times at the El Royale
Larsen Rogers
8.3 TMDB
Hannibal
Randall Tier
7.0 TMDB
The Darkest Minds
Rob Meadows
5.3 TMDB
How It Ends
Jeremiah
6.0 TMDB
Anon
Cyrus Frear
8.0 TMDB
Your Honor
Father Jay
7.6 TMDB
Nuremberg
Colonel John Amen
6.1 TMDB
Kin
Jake
7.7 TMDB
Warehouse 13
Jerry Hoffler
7.9 TMDB
Halt and Catch Fire
Tom Rendon
6.9 TMDB
Killjoys
Grayson Hicks
7.2 TMDB
Perry Mason
Thomas Milligan
5.9 TMDB
The Front Runner
Billy Shore
7.4 TMDB
Blue Bayou
Ace
7.3 TMDB
City on a Hill
Jimmy Ryan
6.0 TMDB
Parallel
Josh
5.1 TMDB
How to Plan an Orgy in a Small Town
Bruce Buck
Filmography
- 2026The Outer ThreatDaniel AshfordMovie
- 2026The Voices of Our MotherWilliam, Director, WriterMovie
- 2025The Copenhagen TestEdmund CobbSeries
- 2025NurembergColonel John AmenMovie
- 2025The Memory KeeperElizeus CarrierMovie
- 2025Shadow of GodMason HarperMovie
- 2025Seven VeilsPaulMovie
- 2025TopperTopperMovie
- 2024The StickyCharlieSeries
- 202261st StreetOfficer LoganSeries
- 2021Blue BayouAceMovie
- 2021The RighteousAaron Smith, Writer, Director, Executive ProducerMovie
- 2020Your HonorFather JaySeries
- 2020Perry MasonThomas MilliganSeries
- 2019HammerChris DavisMovie
- 2019Marriage StoryCarter MitchumMovie
- 2019The Kelly Clarkson ShowSelfSeries
- 2019Ready or NotAlexMovie
- 2019City on a HillJimmy RyanSeries
- 2019GoalieTerry Sawchuk, Executive ProducerMovie
- 2019State Like SleepDarrenMovie
- 2018The Front RunnerBilly ShoreMovie
- 2018Bad Times at the El RoyaleLarsen RogersMovie
- 2018KinJakeMovie
- 2018The Darkest MindsRob MeadowsMovie
- 2018How It EndsJeremiahMovie
- 2018AnonCyrus FrearMovie
- 2018ParallelJoshMovie
- 2017The Last TycoonMax MinerSeries
- 2016ArrivalCaptain MarksMovie
- 2016WandererEric, Director, ProducerMovie
- 2016The Dark StrangerMarkMovie
- 2015How to Plan an Orgy in a Small TownBruce BuckMovie
- 2015KilljoysGrayson HicksSeries
- 2015End of Days, Inc.JasonMovie
- 2015DennisDennis, ProducerMovie
- 2014Halt and Catch FireTom RendonSeries
- 2013HannibalRandall TierSeries
- 2013SweetiefaceSam, Director, Producer, EditorMovie
- 2012Beat DownMichaelMovie
- 2011KathyDirectorMovie
- 2010SnarbuckledJacob O'HigginsMovie
- 2010BradBrad, Producer, EditorMovie
- 2010Grown Up Movie StarWillMovie
- 2010Republic of DoyleDes CourtneySeries
- 2009Mum's the WordCurtisMovie
- 2009Quiet at DawnWattsMovie
- 2009Warehouse 13Jerry HofflerSeries
- 2009Cut from the Same ClothJack CochraneMovie
- 2008Heartless Disappearance Into Labrador SeasCharlieMovie
- 2008EpilogueHenryMovie
- 2008Pretty GirlsDirector, Writer, Editor, CinematographyMovie
- 2008The One That Got AwayTommy PalchekMovie
- 2008The Four HorsemenEric RollinsMovie
- —Better PeopleJohn, Director, Writer, EditorMovie
- —Nice PeopleMovie
- —Good in the RoomCharlie, Writer, Executive ProducerMovie
- —Little OneMovie
- —SomaPaulMovie
- —StillwaterDeputy Ted KeeganSeries