Mark O'Brien
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).
Also Known As
Movie Appearances
Seven Veils
as Paul
2025
The Four Horsemen
as Eric Rollins
2008
Grown Up Movie Star
as Will
2010
Cut from the Same Cloth
as Jack Cochrane
2009
Heartless Disappearance Into Labrador Seas
as Charlie
2008
Shadow of God
as Mason Harper
2025
Snarbuckled
as Jacob O'Higgins
2010
The Dark Stranger
as Mark
2016
Nuremberg
as Colonel John Amen
2025
End of Days, Inc.
as Jason
2015
The Voices of Our Mother
as William
2026
Beat Down
as Michael
2012
Arrival
as Captain Marks
2016
Anon
as Cyrus Frear
2018
State Like Sleep
as Darren
2019
Kin
as Jake
2018
Parallel
as Josh
2018
The Darkest Minds
as Rob Meadows
2018
How to Plan an Orgy in a Small Town
as Bruce Buck
2015
Bad Times at the El Royale
as Larsen Rogers
2018
TV Appearances
Perry Mason
as Thomas Milligan
2020
Republic of Doyle
as Des Courtney
2010
The Last Tycoon
as Max Miner
2017
61st Street
as Officer Logan
2022
Killjoys
as Grayson Hicks
2015
The Kelly Clarkson Show
as Self
2019
City on a Hill
as Jimmy Ryan
2019
Hannibal
as Randall Tier
2013
Warehouse 13
as Jerry Hoffler
2009
Halt and Catch Fire
as Tom Rendon
2014
Your Honor
as Father Jay
2020
The Copenhagen Test
as Edmund Cobb
2025