Acting · St. Johns, Newfoundland, Canada · Born May 7, 1984
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).
MovieThe Outer Threat
2026
MovieThe Voices of Our Mother
2026
as William
TVThe Copenhagen Test
2025
as Edmund Cobb
MovieNuremberg
2025
as Colonel John Amen
MovieThe Memory Keeper
2025
as Elizeus Carrier
MovieShadow of God
2025
as Mason Harper
MovieSeven Veils
2025
as Paul
MovieTopper
2025
as Topper
TVThe Sticky
2024
as Charlie
TV61st Street
2022
as Officer Logan
MovieBlue Bayou
2021
as Ace
MovieThe Righteous
2021
as Aaron Smith
TVYour Honor
2020
as Father Jay
TVPerry Mason
2020
as Thomas Milligan
MovieHammer
2019
as Chris Davis
MovieMarriage Story
2019
as Carter Mitchum
TVThe Kelly Clarkson Show
2019
as Self
MovieReady or Not
2019
as Alex
TVCity on a Hill
2019
as Jimmy Ryan
MovieGoalie
2019
as Terry Sawchuk
MovieState Like Sleep
2019
as Darren
MovieThe Front Runner
2018
as Billy Shore
MovieBad Times at the El Royale
2018
as Larsen Rogers
MovieKin
2018
as Jake
MovieThe Darkest Minds
2018
as Rob Meadows
MovieHow It Ends
2018
as Jeremiah
MovieAnon
2018
as Cyrus Frear
MovieParallel
2018
as Josh
TVThe Last Tycoon
2017
as Max Miner
MovieArrival
2016
as Captain Marks
MovieWanderer
2016
as Eric
MovieThe Dark Stranger
2016
as Mark
MovieHow to Plan an Orgy in a Small Town
2015
as Bruce Buck
TVKilljoys
2015
as Grayson Hicks
MovieEnd of Days, Inc.
2015
as Jason
MovieDennis
2015
as Dennis
TVHalt and Catch Fire
2014
as Tom Rendon
TVHannibal
2013
as Randall Tier
Sweetieface
2013
as Sam
MovieBeat Down
2012
as Michael
MovieSnarbuckled
2010
as Jacob O'Higgins
Brad
2010
as Brad
MovieGrown Up Movie Star
2010
as Will
TVRepublic of Doyle
2010
as Des Courtney
Mum's the Word
2009
as Curtis
Quiet at Dawn
2009
as Watts
TVWarehouse 13
2009
as Jerry Hoffler
Cut from the Same Cloth
2009
as Jack Cochrane
MovieHeartless Disappearance Into Labrador Seas
2008
as Charlie
Epilogue
2008
as Henry
MovieThe One That Got Away
2008
as Tommy Palchek
MovieThe Four Horsemen
2008
as Eric Rollins
Better People
as John
Nice People
Good in the Room
as Charlie
MovieLittle One
