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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
+3
as Captain Marks 
Republic of Doyle
as Des Courtney 
Ready or Not
+3
as Alex 
Nuremberg
+4
as Colonel John Amen 
Marriage Story
as Carter Mitchum 
The Darkest Minds
+3
as Rob Meadows 
The Copenhagen Test
as Edmund Cobb 
Kin
+4
as Jake 
Bad Times at the El Royale
+4
as Larsen Rogers 
How It Ends
as Jeremiah 
The Last Tycoon
as Max Miner 
The Front Runner
+1
as Billy Shore 
Anon
as Cyrus Frear 
The Outer Threat
as Daniel Ashford 
Blue Bayou
+4
as Ace 
Parallel
+2
as Josh 
Seven Veils
+3
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.
+2
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