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Actor
Mark O'Brien
Mark O'Brien’s screen credits include Carter Mitchum in Marriage Story, Alex in Ready or Not, and Daniel Ashford in The Outer Threat.
Born May 7, 1984 St. Johns, Newfoundland, Canada4 movies on MoviHero
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Where to start
A selection of released films from our catalog, with the credited role to help you choose.
THE PERSON BEHIND THE ROLES
About Mark O'Brien
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
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MOVIHERO CREDITS
Movies and roles
Explore 4 movie guides, credited roles and upcoming releases.
Movies on MoviHero 4
Showing 4 of 4 credits
More film credits 42 additional titles
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Showing 8 of 42 credits
- 2026The Voices of Our MotherDirector · Writer · William
- 2025NurembergColonel John Amen
- 2025The Memory KeeperElizeus Carrier
- 2025Shadow of GodMason Harper
- 2025Seven VeilsPaul
- 2025TopperTopper
- 2021Blue BayouAce
- 2021The RighteousWriter · Director · Producer · Aaron Smith
- 2019HammerChris Davis
- 2019GoalieProducer · Terry Sawchuk
- 2019State Like SleepDarren
- 2018The Front RunnerBilly Shore
- 2018Bad Times at the El RoyaleLarsen Rogers
- 2018KinJake
- 2018The Darkest MindsRob Meadows
- 2018How It EndsJeremiah
- 2018AnonCyrus Frear
- 2018ParallelJosh
- 2016WandererDirector · Producer · Eric
- 2016The Dark StrangerMark
- 2015How to Plan an Orgy in a Small TownBruce Buck
- 2015End of Days, Inc.Jason
- 2015DennisProducer · Dennis
- 2013SweetiefaceDirector · Producer · Sam
- 2012Beat DownMichael
- 2011KathyDirector
- 2010SnarbuckledJacob O'Higgins
- 2010BradProducer · Brad
- 2010Grown Up Movie StarWill
- 2009Mum's the WordCurtis
- 2009Quiet at DawnWatts
- 2009Cut from the Same ClothJack Cochrane
- 2008Heartless Disappearance Into Labrador SeasCharlie
- 2008EpilogueHenry
- 2008Pretty GirlsDirector · Writer
- 2008The One That Got AwayTommy Palchek
- 2008The Four HorsemenEric Rollins
- Better PeopleDirector · Writer · John
- Good in the RoomWriter · Producer · Charlie
- Little OneActor
- Nice PeopleActor · Director
- SomaPaul
CHARACTER GUIDES
Characters and roles
Explore character guides connected to Mark O'Brien's movie credits.
Daniel Ashford
The Outer Threat
Open character guideAlex
Ready or Not
Open character guideCaptain Marks
Arrival
Open character guideCONNECTED THROUGH MOVIES
Shared credits
Discover the people who share these films.
Actor
Abigail Pniowsky
1 shared film on MoviHeroActor
Adam Brody
1 shared film on MoviHeroActor
Adam Driver
1 shared film on MoviHeroActor