Mark O'Brien
Acting
Born
May 07, 1984
From
St. Johns, Newfoundland, Canada
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
Filmography — Acting
7.0
2019
Ready or Not
Alex Le Domas
7.4
2025
Nuremberg
Colonel John Amen
7.6
2016
Arrival
Captain Marks
7.7
2019
Marriage Story
Carter Mitchum
6.0
2018
Anon
Cyrus Frear
7.0
2018
The Darkest Minds
Rob Meadows
6.8
2018
Bad Times at the El Royale
Larsen Rogers
6.1
2018
Kin
Jake
6.0
2018
Parallel
Josh
5.3
2018
How It Ends
Jeremiah
5.6
2025
Seven Veils
Paul
5.7
2025
Shadow of God
Mason Harper
5.9
2018
The Front Runner
Billy Shore
5.1
2015
How to Plan an Orgy in a Small Town
Bruce Buck
7.5
2021
Blue Bayou
Ace
3.8
2008
The Four Horsemen
Eric Rollins
5.4
2019
Hammer
Chris Davis
7.0
2019
Goalie
Terry Sawchuk
5.1
2010
Grown Up Movie Star
Will
2012
Beat Down
Michael
4.7
2019
State Like Sleep
Darren
The Outer Threat
4.3
2008
The One That Got Away
Tommy Palchek
2025
Falsehood
Elizeus Carrier
6.2
2021
The Righteous
Aaron Smith
2008
Heartless Disappearance Into Labrador Seas
Charlie
5.7
2015
End of Days, Inc.
Jason
5.3
2025
Topper
Topper
The Voices of Our Mother
William
2015
Dennis
Dennis
2010
Snarbuckled
Jacob O'Higgins
2010
Brad
Brad
2009
Cut from the Same Cloth
Jack Cochrane
4.9
2016
The Dark Stranger
Mark
2009
Mum's the Word
Curtis
2008
Epilogue
Henry
2013
Sweetieface
Sam
2016
Wanderer
Eric
Nice People
2009
Quiet at Dawn
Watts
Better People
John
