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
2022
Warehouse 13
2011
Hannibal
2014
Perry Mason
2023
Halt and Catch Fire
2015
Republic of Doyle
2010
Arrival
2016
Killjoys
2015
Ready or Not
2019
Your Honor
2023
City on a Hill
2019
Nuremberg
2025

FILMOGRAPHY

All
Movies
TV
Acting
57
Directing
8
Writing
5
Producing
7
Editing
4
Crew
1
2026
The Voices of Our Mother
as William
2026
The Outer Threat
as Daniel Ashford
2025
Seven Veils
as Paul
2025
Shadow of God
as Mason Harper
2025
Nuremberg
as Colonel John Amen
2025
The Memory Keeper
as Elizeus Carrier
2025
Topper
as Topper
2025
The Copenhagen Test
as Edmund Cobb
2024
The Sticky
as Charlie
2023
Perry Mason
as Thomas Milligan
2023
Your Honor
as Father Jay
2022
61st Street
as Officer Logan
2022
The Kelly Clarkson Show
as Self
2021
Blue Bayou
as Ace
2021
The Righteous
as Aaron Smith
2019
State Like Sleep
as Darren
2019
Marriage Story
as Carter Mitchum
2019
Goalie
as Terry Sawchuk
2019
Hammer
as Chris Davis
2019
Ready or Not
as Alex
2019
City on a Hill
as Jimmy Ryan
2018
Anon
as Cyrus Frear
2018
Kin
as Jake
2018
Parallel
as Josh
2018
The Darkest Minds
as Rob Meadows
2018
Bad Times at the El Royale
as Larsen Rogers
2018
The Front Runner
as Billy Shore
2018
How It Ends
as Jeremiah
2017
The Last Tycoon
as Max Miner
2016
The Dark Stranger
as Mark
2016
Arrival
as Captain Marks
2016
Wanderer
as Eric
2015
End of Days, Inc.
as Jason
2015
How to Plan an Orgy in a Small Town
as Bruce Buck
2015
Dennis
as Dennis
2015
Killjoys
as Grayson Hicks
2015
Halt and Catch Fire
as Tom Rendon
2014
Hannibal
as Randall Tier
2013
Sweetieface
as Sam
2012
Beat Down
as Michael
2011
Warehouse 13
as Jerry Hoffler
2010
Grown Up Movie Star
as Will
2010
Snarbuckled
as Jacob O'Higgins
2010
Brad
as Brad
2010
Republic of Doyle
as Des Courtney
2009
Cut from the Same Cloth
as Jack Cochrane
2009
Mum's the Word
as Curtis
2009
Quiet at Dawn
as Watts
2008
The Four Horsemen
as Eric Rollins
2008
Heartless Disappearance Into Labrador Seas
as Charlie
2008
Epilogue
as Henry
2008
The One That Got Away
as Tommy Palchek
Better People
as John
Nice People
Good in the Room
as Charlie
Little One
Soma
as Paul