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