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