Mark O'Brien

Acting

Mark O'Brien

Born 7 May 1984 · St. Johns, Newfoundland, Canada · 42

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

Highlights

Arrival2016 · Film · Captain Marks
Marriage Story2019 · Film · Carter Mitchum
Hannibal2013 · Series · Randall Tier
Ready or Not2019 · Film · Alex
Your Honor2020 · Series · Father Jay
Bad Times at the El Royale2018 · Film · Larsen Rogers

Filmography

Movies

36 films

The Outer Threat2026 · Film · Daniel Ashford
The Voices of Our Mother2026 · Film · William
Nuremberg2025 · Film · Colonel John Amen
The Memory Keeper2025 · Film · Elizeus Carrier
Shadow of God2025 · Film · Mason Harper
Seven Veils2025 · Film · Paul
Topper2025 · Film · Topper
Blue Bayou2021 · Film · Ace
The Righteous2021 · Film · Aaron Smith
Hammer2019 · Film · Chris Davis
Marriage Story2019 · Film · Carter Mitchum
Ready or Not2019 · Film · Alex
Goalie2019 · Film · Terry Sawchuk
State Like Sleep2019 · Film · Darren
The Front Runner2018 · Film · Billy Shore
Bad Times at the El Royale2018 · Film · Larsen Rogers
Kin2018 · Film · Jake
The Darkest Minds2018 · Film · Rob Meadows
How It Ends2018 · Film · Jeremiah
Anon2018 · Film · Cyrus Frear
Parallel2018 · Film · Josh
Arrival2016 · Film · Captain Marks
Wanderer2016 · Film · Eric
The Dark Stranger2016 · Film · Mark
How to Plan an Orgy in a Small Town2015 · Film · Bruce Buck
End of Days, Inc.2015 · Film · Jason
Dennis2015 · Film · Dennis
Beat Down2012 · Film · Michael
Kathy2011 · Film · Director
Snarbuckled2010 · Film · Jacob O'Higgins
Grown Up Movie Star2010 · Film · Will
Mum's the Word2009 · Film · Curtis
Cut from the Same Cloth2009 · Film · Jack Cochrane
Heartless Disappearance Into Labrador Seas2008 · Film · Charlie
The One That Got Away2008 · Film · Tommy Palchek
The Four Horsemen2008 · Film · Eric Rollins

Filmography

Series

12 shows

The Copenhagen Test2025 · Series · Edmund Cobb
The Sticky2024 · Series · Charlie
61st Street2022 · Series · Officer Logan
Your Honor2020 · Series · Father Jay
Perry Mason2020 · Series · Thomas Milligan
City on a Hill2019 · Series · Jimmy Ryan
The Last Tycoon2017 · Series · Max Miner
Killjoys2015 · Series · Grayson Hicks
Halt and Catch Fire2014 · Series · Tom Rendon
Hannibal2013 · Series · Randall Tier
Republic of Doyle2010 · Series · Des Courtney
Warehouse 132009 · Series · Jerry Hoffler