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 Outer Threat (2026)
as Daniel Ashford
Bad Times at the El Royale (2018)
as Larsen Rogers
Marriage Story (2019)
as Carter Mitchum
The Darkest Minds (2018)
as Rob Meadows
Anon (2018)
as Cyrus Frear
How It Ends (2018)
as Jeremiah
The Front Runner (2018)
as Billy Shore
Kin (2018)
as Jake
Parallel (2018)
as Josh
Blue Bayou (2021)
as Ace
Seven Veils (2025)
as Paul
Shadow of God (2025)
as Mason Harper
The Memory Keeper (2025)
as Elizeus Carrier
The Dark Stranger (2016)
as Mark
How to Plan an Orgy in a Small Town (2015)
as Bruce Buck
Beat Down (2012)
as Michael
Goalie (2019)
as Terry Sawchuk
Little One (—)
Actor
The Righteous (2021)
as Aaron Smith
State Like Sleep (2019)
as Darren
Epilogue (2008)
as Henry
The Four Horsemen (2008)
as Eric Rollins
The Voices of Our Mother (2026)
as William
Dennis (2015)
as Dennis
Better People (—)
as John
Hammer (2019)
as Chris Davis
Brad (2010)
as Brad
The One That Got Away (2008)
as Tommy Palchek
Heartless Disappearance Into Labrador Seas (2008)
as Charlie
Good in the Room (—)
as Charlie
Topper (2025)
as Topper
End of Days, Inc. (2015)
as Jason
Grown Up Movie Star (2010)
as Will
Quiet at Dawn (2009)
as Watts
Wanderer (2016)
as Eric
Nice People (—)
Actor
Cut from the Same Cloth (2009)
as Jack Cochrane
Sweetieface (2013)
as Sam
Soma (—)
as Paul
Mum's the Word (2009)
as Curtis
Snarbuckled (2010)
as Jacob O'Higgins