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