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Mark O'Brien
Known for: ActingMark 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).
Filmography 30
Arrival
as Captain Marks 
Ready or Not
as Alex 
Republic of Doyle
as Des Courtney 
Nuremberg
as Colonel John Amen 
Marriage Story
as Carter Mitchum 
The Copenhagen Test
as Edmund Cobb 
The Darkest Minds
as Rob Meadows 
Kin
as Jake 
Bad Times at the El Royale
as Larsen Rogers 
How It Ends
as Jeremiah 
The Last Tycoon
as Max Miner 
The Front Runner
as Billy Shore 
Anon
as Cyrus Frear 
The Outer Threat
as Daniel Ashford 
Blue Bayou
as Ace 
Parallel
as Josh 
Seven Veils
as Paul 
Shadow of God
as Mason Harper 
How to Plan an Orgy in a Small Town
as Bruce Buck 
Hammer
as Chris Davis 
The Voices of Our Mother
as William 
State Like Sleep
as Darren 
Goalie
as Terry Sawchuk 
The Dark Stranger
as Mark 
The Memory Keeper
as Elizeus Carrier 
End of Days, Inc.
as Jason 
The One That Got Away
as Tommy Palchek 
Heartless Disappearance Into Labrador Seas
as Charlie 
The Righteous
as Aaron Smith 
Topper
as Topper