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Mark O'Brien
ACTOR

Mark O'Brien

Known for Marriage Story · Ready or Not · Bad Times at the El Royale

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).

Snapshot 2026-10-16

Born
May 7, 1984
Birthplace
St. Johns, Newfoundland, Canada
Known For
Acting

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).

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Known For

MOVIEMarriage Story
Marriage StoryCarter Mitchum · 2019
★ 7.7
MOVIEReady or Not
Ready or NotAlex · 2019
★ 7.1
MOVIEBad Times at the El Royale
Bad Times at the El RoyaleLarsen Rogers · 2018
★ 6.8
TVHannibal
HannibalRandall Tier · 2013
★ 8.3
TVYour Honor
Your HonorFather Jay · 2020
★ 8.0
MOVIENuremberg
NurembergColonel John Amen · 2025
★ 7.6
TVWarehouse 13
Warehouse 13Jerry Hoffler · 2009
★ 7.7
TVHalt and Catch Fire
Halt and Catch FireTom Rendon · 2014
★ 7.9

Filmography

Movies

E
EpilogueHenry
2008
Heartless Disappearance Into Labrador SeasCharlie
2008
PG
Pretty GirlsDirector
2008
PG
Pretty GirlsWriter
2008
PG
Pretty GirlsEditor
2008
PG
Pretty GirlsCinematography
2008
The Four HorsemenEric Rollins
2008
The One That Got AwayTommy Palchek
2008
CF
Cut from the Same ClothJack Cochrane
2009
MT
Mum's the WordCurtis
2009
QA
Quiet at DawnWatts
2009
B
BradBrad
2010
B
BradProducer
2010
B
BradEditor
2010
Grown Up Movie StarWill
2010
SnarbuckledJacob O'Higgins
2010
KathyDirector
2011
Beat DownMichael
2012
S
SweetiefaceSam
2013
S
SweetiefaceDirector
2013
S
SweetiefaceProducer
2013
S
SweetiefaceEditor
2013
DennisDennis
2015
DennisProducer
2015
End of Days, Inc.Jason
2015
How to Plan an Orgy in a Small TownBruce Buck
2015
ArrivalCaptain Marks
2016
The Dark StrangerMark
2016
WandererEric
2016
WandererDirector
2016
WandererProducer
2016
AnonCyrus Frear
2018
Bad Times at the El RoyaleLarsen Rogers
2018
How It EndsJeremiah
2018
KinJake
2018
ParallelJosh
2018
The Darkest MindsRob Meadows
2018
The Front RunnerBilly Shore
2018
GoalieTerry Sawchuk
2019
GoalieExecutive Producer
2019
HammerChris Davis
2019
Marriage StoryCarter Mitchum
2019
Ready or NotAlex
2019
State Like SleepDarren
2019
Blue BayouAce
2021
The RighteousAaron Smith
2021
The RighteousExecutive Producer
2021
The RighteousDirector
2021
The RighteousWriter
2021
NurembergColonel John Amen
2025
Seven VeilsPaul
2025
Shadow of GodMason Harper
2025
The Memory KeeperElizeus Carrier
2025
TopperTopper
2025
The Outer ThreatDaniel Ashford
2026
The Voices of Our MotherWilliam
2026
The Voices of Our MotherDirector
2026
The Voices of Our MotherWriter
2026
BP
Better PeopleJohn
BP
Better PeopleDirector
BP
Better PeopleWriter
BP
Better PeopleEditor
GI
Good in the RoomCharlie
GI
Good in the RoomWriter
GI
Good in the RoomExecutive Producer
Little One
NP
Nice People
NP
Nice PeopleDirector
S
SomaPaul

Television

Warehouse 13Jerry Hoffler · 1 eps
2009
Republic of DoyleDes Courtney · 77 eps
2010
HannibalRandall Tier · 2 eps
2013
Halt and Catch FireTom Rendon · 15 eps
2014
KilljoysGrayson Hicks · 1 eps
2015
The Last TycoonMax Miner · 9 eps
2017
City on a HillJimmy Ryan · 14 eps
2019
The Kelly Clarkson ShowSelf · 1 eps
2019
Perry MasonThomas Milligan · 7 eps
2020
Your HonorFather Jay · 3 eps
2020
61st StreetOfficer Logan · 8 eps
2022
The StickyCharlie · 1 eps
2024
The Copenhagen TestEdmund Cobb · 8 eps
2025

Photos

Mark O'Brien photo
Mark O'Brien photo
Mark O'Brien photo
Mark O'Brien photo
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