Mark O'Brien
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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
Credits
Arrival (2016)
as Captain Marks
Ready or Not (2019)
as Alex
Nuremberg (2025)
as Colonel John Amen
The Darkest Minds (2018)
as Rob Meadows
Marriage Story (2019)
as Carter Mitchum
Bad Times at the El Royale (2018)
as Larsen Rogers
The Voices of Our Mother (2026)
as William
Anon (2018)
as Cyrus Frear
How It Ends (2018)
as Jeremiah
Kin (2018)
as Jake
The Front Runner (2018)
as Billy Shore
Parallel (2018)
as Josh
Seven Veils (2025)
as Paul
Blue Bayou (2021)
as Ace
Shadow of God (2025)
as Mason Harper
How to Plan an Orgy in a Small Town (2015)
as Bruce Buck
The Outer Threat (2026)
Actor
The Righteous (2021)
as Aaron Smith
The Four Horsemen (2008)
as Eric Rollins
Hammer (2019)
as Chris Davis
Beat Down (2012)
as Michael
State Like Sleep (2019)
as Darren
Goalie (2019)
as Terry Sawchuk
The Memory Keeper (2025)
as Elizeus Carrier
The One That Got Away (2008)
as Tommy Palchek
Topper (2025)
as Topper
The Dark Stranger (2016)
as Mark
Little One (—)
Actor
Dennis (2015)
as Dennis
Grown Up Movie Star (2010)
as Will
Nice People (—)
Actor
Heartless Disappearance Into Labrador Seas (2008)
as Charlie
Better People (—)
as John
End of Days, Inc. (2015)
as Jason
Good in the Room (—)
as Charlie
Cut from the Same Cloth (2009)
as Jack Cochrane
Mum's the Word (2009)
as Curtis
Wanderer (2016)
as Eric
Snarbuckled (2010)
as Jacob O'Higgins
Epilogue (2008)
as Henry
Brad (2010)
as Brad
Quiet at Dawn (2009)
as Watts
Sweetieface (2013)
as Sam