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
Kin (2018)
as Jake
How It Ends (2018)
as Jeremiah
The Front Runner (2018)
as Billy Shore
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
How to Plan an Orgy in a Small Town (2015)
as Bruce Buck
The Dark Stranger (2016)
as Mark
Little One (—)
Actor
Goalie (2019)
as Terry Sawchuk
Beat Down (2012)
as Michael
State Like Sleep (2019)
as Darren
The Righteous (2021)
as Aaron Smith
The Voices of Our Mother (2026)
as William
The Four Horsemen (2008)
as Eric Rollins
Dennis (2015)
as Dennis
Epilogue (2008)
as Henry
Hammer (2019)
as Chris Davis
Better People (—)
as John
Brad (2010)
as Brad
Good in the Room (—)
as Charlie
The One That Got Away (2008)
as Tommy Palchek
Heartless Disappearance Into Labrador Seas (2008)
as Charlie
Topper (2025)
as Topper
Grown Up Movie Star (2010)
as Will
End of Days, Inc. (2015)
as Jason
Quiet at Dawn (2009)
as Watts
Nice People (—)
Actor
Wanderer (2016)
as Eric
Cut from the Same Cloth (2009)
as Jack Cochrane
Mum's the Word (2009)
as Curtis
Sweetieface (2013)
as Sam
Snarbuckled (2010)
as Jacob O'Higgins
Soma (—)
as Paul