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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
+12
as Captain Marks 
Republic of Doyle
+13
as Des Courtney 
Ready or Not
+8
as Alex 
Nuremberg
+5
as Colonel John Amen 
Marriage Story
as Carter Mitchum 
The Darkest Minds
+1
as Rob Meadows 
The Copenhagen Test
+3
as Edmund Cobb 
Kin
+6
as Jake 
Bad Times at the El Royale
+2
as Larsen Rogers 
How It Ends
as Jeremiah 
The Last Tycoon
+5
as Max Miner 
The Front Runner
+3
as Billy Shore 
Anon
as Cyrus Frear 
The Outer Threat
+3
as Daniel Ashford 
Blue Bayou
+6
as Ace 
Parallel
+10
as Josh 
Seven Veils
+3
as Paul 
Shadow of God
+10
as Mason Harper 
How to Plan an Orgy in a Small Town
+2
as Bruce Buck 
Hammer
+2
as Chris Davis 
The Voices of Our Mother
+8
as William 
State Like Sleep
+7
as Darren 
Goalie
+8
as Terry Sawchuk 
The Dark Stranger
+2
as Mark 
The Memory Keeper
+9
as Elizeus Carrier 
End of Days, Inc.
as Jason 
The One That Got Away
+6
as Tommy Palchek 
+1 
The Righteous
+12
as Aaron Smith 
Topper
+5
as Topper