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
Arrival
(2016)
Captain Marks
Ready or Not
(2019)
Alex Le Domas
The Darkest Minds
(2018)
Rob Meadows
Kin
(2018)
Jake
Marriage Story
(2019)
Carter Mitchum
Bad Times at the El Royale
(2018)
Larsen Rogers
Anon
(2018)
Cyrus Frear
Parallel
(2018)
Josh
Blue Bayou
(2021)
Ace
How to Plan an Orgy in a Small Town
(2015)
Bruce Buck
How It Ends
(2018)
Jeremiah
The Front Runner
(2018)
Billy Shore
The Four Horsemen
(2008)
Eric Rollins
Full Filmography
Acting
The Four Horsemen
(2008)
Eric Rollins
Heartless Disappearance Into Labrador Seas
(2008)
Charlie
Grown Up Movie Star
(2009)
Will
Cut from the Same Cloth
(2009)
Jack Cochrane
Snarbuckled
(2010)
Jacob O'Higgins
Beat Down
(2012)
Michael
End of Days, Inc.
(2015)
Jason
How to Plan an Orgy in a Small Town
(2015)
Bruce Buck
The Dark Stranger
(2016)
Mark
Arrival
(2016)
Captain Marks
Anon
(2018)
Cyrus Frear
Kin
(2018)
Jake
Parallel
(2018)
Josh
The Darkest Minds
(2018)
Rob Meadows
Bad Times at the El Royale
(2018)
Larsen Rogers
The Front Runner
(2018)
Billy Shore
How It Ends
(2018)
Jeremiah
State Like Sleep
(2019)
Darren
Marriage Story
(2019)
Carter Mitchum
Goalie
(2019)
Terry Sawchuk
Hammer
(2019)
Chris Davis
Ready or Not
(2019)
Alex Le Domas
Blue Bayou
(2021)
Ace
The Righteous
(2021)
Aaron Smith
Seven Veils
(2023)
Paul
Directing
Production
Writing