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Personal info
Known for
Acting
Gender
Male
Birthday
2 / May / 1984 (40 years old)
Place of Birth
St. Johns, Newfoundland, Canada
Also Known As
Mark O’Brien
Mark O'Brien
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
8.2
Hannibal
5 / Apr / 2013
8.1
Your Honor
1 / Dec / 2020
7.9
Halt and Catch Fire
1 / Jun / 2014
7.7
Marriage Story
7 / Sep / 2019
7.7
Warehouse 13
3 / Jul / 2009
7.6
Arrival
5 / Nov / 2016
7.5
Blue Bayou
6 / Sep / 2021
7.4
City on a Hill
1 / Jun / 2019
7.3
Perry Mason
1 / Jun / 2020
7.2
The Sticky
6 / Dec / 2024
Credits
All
Department
Acting
-
•
Nuremberg
as Col. John Amen
-
•
The Voices of Our Mother
as William
-
•
The Embers and the Stars
-
•
Falsehood
as Elizeus Carrier
-
•
Copenhagen
(2 episodes) as Cobb
2025
•
Seven Veils
as Paul
2025
•
Shadow of God
as Mason Harper
2024
•
The Sticky
(1 episode) as Charlie
2022
•
61st Street
(8 episodes) as Officer Logan
2021
•
Blue Bayou
as Ace
2021
•
The Righteous
as Aaron Smith
2020
•
Perry Mason
(7 episodes) as Thomas Milligan
2020
•
Your Honor
(3 episodes) as Father Jay
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 Le Domas
2019
•
The Kelly Clarkson Show
(1 episode)
2019
•
City on a Hill
(14 episodes) 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
(9 episodes) as Max Miner
2016
•
The Dark Stranger
as Mark
2016
•
Arrival
as Captain Marks
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
(1 episode) as Grayson Hicks
2014
•
Halt and Catch Fire
(15 episodes) as Tom Rendon
2013
•
Hannibal
(2 episodes) as Randall Tier
2012
•
Beat Down
as Michael
2010
•
Snarbuckled
as Jacob O'Higgins
2010
•
Brad
as Brad
2010
•
Republic of Doyle
(77 episodes) as Des Courtney
2009
•
Grown Up Movie Star
as Will
2009
•
Cut from the Same Cloth
as Jack Cochrane
2009
•
Mum's the Word
as Curtis
2009
•
Quiet at Dawn
as Watts
2009
•
Warehouse 13
(1 episode) as Jerry Hoffler
2008
•
The Four Horsemen
as Eric Rollins
2008
•
Heartless Disappearance Into Labrador Seas
as Charlie
2008
•
Epilogue
as Henry
Directing
-
•
The Voices of Our Mother
Director
2021
•
The Righteous
Director
2016
•
Wanderer
Director
2011
•
Kathy
Director
Editing
2010
•
Brad
Editor
Production
2021
•
The Righteous
Executive Producer
2019
•
Goalie
Executive Producer
2015
•
Dennis
Producer
2010
•
Brad
Producer
Writing
-
•
The Voices of Our Mother
Writer
2021
•
The Righteous
Writer