Person
Mark O'Brien
Acting · Born 1984-05-07 · 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
The Kelly Clarkson Show
Self
Hannibal
Randall Tier
Republic of Doyle
Des Courtney
Warehouse 13
Jerry Hoffler
Perry Mason
Thomas Milligan
Arrival
Captain Marks
Nuremberg
Colonel John Amen
Ready or Not
Alex
Killjoys
Grayson Hicks
Halt and Catch Fire
Tom Rendon
Filmography
- 2026The Outer Threat
- 2026The Voices of Our MotherWilliam
- 2025The Copenhagen TestEdmund Cobb
- 2025NurembergColonel John Amen
- 2025The Memory KeeperElizeus Carrier
- 2025Shadow of GodMason Harper
- 2025Seven VeilsPaul
- 2025TopperTopper
- 2024The StickyCharlie
- 202261st StreetOfficer Logan
- 2021Blue BayouAce
- 2021The RighteousAaron Smith
- 2020Your HonorFather Jay
- 2020Perry MasonThomas Milligan
- 2019HammerChris Davis
- 2019Marriage StoryCarter Mitchum
- 2019The Kelly Clarkson ShowSelf
- 2019Ready or NotAlex
- 2019City on a HillJimmy Ryan
- 2019GoalieTerry 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
- 2017The Last TycoonMax Miner
- 2016ArrivalCaptain Marks
- 2016WandererEric
- 2016The Dark StrangerMark
- 2015How to Plan an Orgy in a Small TownBruce Buck
- 2015KilljoysGrayson Hicks
- 2015End of Days, Inc.Jason
- 2015DennisDennis
- 2014Halt and Catch FireTom Rendon
- 2013HannibalRandall Tier
- 2013SweetiefaceSam
- 2012Beat DownMichael
- 2011KathyDirector
- 2010SnarbuckledJacob O'Higgins
- 2010BradBrad
- 2010Grown Up Movie StarWill
- 2010Republic of DoyleDes Courtney
- 2009Mum's the WordCurtis
- 2009Quiet at DawnWatts
- 2009Warehouse 13Jerry Hoffler
- 2009Cut from the Same ClothJack Cochrane
- 2008Heartless Disappearance Into Labrador SeasCharlie
- 2008EpilogueHenry
- 2008Pretty GirlsDirector
- 2008The One That Got AwayTommy Palchek
- 2008The Four HorsemenEric Rollins
- —Better PeopleJohn
- —Nice People
- —Good in the RoomCharlie
- —Little One
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