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Mark O'Brien
🎭 Acting

Mark O'Brien

May 7, 1984 (age 41)
St. Johns, Newfoundland, Canada
Male
41
13

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).

Movies

41 credits
Nuremberg Movie
★ 7.3
Drama, History
2025 Drama, History
Arrival Movie
★ 7.6
Drama, Mystery
2016 Drama, Mystery
Ready or Not
★ 7.0
+
Ready or Not
2019 as Alex Le Domas
Marriage Story
★ 7.7
+
Marriage Story
2019 as Carter Mitchum
How It Ends
★ 5.3
+
How It Ends
2018 as Jeremiah
Anon
★ 6.0
+
Anon
2018 as Cyrus Frear
Topper
★ 5.3
+
Topper
2025 as Topper
How to Plan an Orgy in a Small Town
★ 5.1
+
How to Plan an Orgy in a Small Town
2015 as Bruce Buck
Bad Times at the El Royale
★ 6.8
+
Bad Times at the El Royale
2018 as Larsen Rogers
Heartless Disappearance Into Labrador Seas
+
Heartless Disappearance Into Labrador Seas
2008 as Charlie
The Darkest Minds
★ 7.0
+
The Darkest Minds
2018 as Rob Meadows
Kin
★ 6.1
+
Kin
2018 as Jake
Parallel
★ 6.0
+
Parallel
2018 as Josh
Shadow of God
★ 5.7
+
Shadow of God
2025 as Mason Harper
Nice People
+
Nice People
Blue Bayou
★ 7.5
+
Blue Bayou
2021 as Ace
Cut from the Same Cloth
+
Cut from the Same Cloth
2009 as Jack Cochrane
The Front Runner
★ 5.9
+
The Front Runner
2018 as Billy Shore
Seven Veils
★ 5.6
+
Seven Veils
2025 as Paul
Falsehood
+
Falsehood
2025 as Elizeus Carrier
Dennis
+
Dennis
2015 as Dennis
Hammer
★ 5.4
+
Hammer
2019 as Chris Davis
Sweetieface
+
Sweetieface
2013 as Sam
Wanderer
+
Wanderer
2016 as Eric
The One That Got Away
★ 4.3
+
The One That Got Away
2008 as Tommy Palchek
The Outer Threat
+
The Outer Threat
State Like Sleep
★ 4.7
+
State Like Sleep
2019 as Darren
Goalie
★ 7.0
+
Goalie
2019 as Terry Sawchuk
The Righteous
★ 6.2
+
The Righteous
2021 as Aaron Smith
Grown Up Movie Star
★ 5.1
+
Grown Up Movie Star
2009 as Will

TV Shows

13 credits
The Kelly Clarkson Show TV
★ 6.4
Talk
Warehouse 13 TV
★ 7.7
Action & Adventure, Comedy
2009 Action & Adventure, Comedy
Hannibal TV
★ 8.2
Crime, Drama
2013 Crime, Drama
Killjoys TV
+
Killjoys
2015 as Grayson Hicks
Perry Mason TV
+
Perry Mason
2020 as Thomas Milligan
Halt and Catch Fire TV
+
Halt and Catch Fire
2014 as Tom Rendon
The Copenhagen Test TV
+
The Copenhagen Test
2025 as Edmund Cobb
Republic of Doyle TV
+
Republic of Doyle
2010 as Des Courtney
Your Honor TV
+
Your Honor
2020 as Father Jay
City on a Hill TV
+
City on a Hill
2019 as Jimmy Ryan
61st Street TV
+
61st Street
2022 as Officer Logan
The Sticky TV
+
The Sticky
2024 as Charlie
The Last Tycoon TV
+
The Last Tycoon
2017 as Max Miner