Mark O'Brien photo

Mark O'Brien

Acting
1984-05-07
St. Johns, Newfoundland, Canada
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 44 titles
The Kelly Clarkson Show (2019) subtitle poster
The Kelly Clarkson Show
2019 TV
as Self
Subtitles Hannibal (2013) subtitle poster
Hannibal
2013 TV
as Randall Tier
Subtitles Warehouse 13 (2009) subtitle poster
Warehouse 13
2009 TV
as Jerry Hoffler
Subtitles Ready or Not (2019) subtitle poster
Ready or Not
2019 Movie
as Alex Le Domas
Subtitles Perry Mason (2020) subtitle poster
Perry Mason
2020 TV
as Thomas Milligan
Subtitles Nuremberg (2025) subtitle poster
Nuremberg
2025 Movie
as Colonel John Amen
Subtitles Halt and Catch Fire (2014) subtitle poster
Halt and Catch Fire
2014 TV
as Tom Rendon
Subtitles Republic of Doyle (2010) subtitle poster
Republic of Doyle
2010 TV
as Des Courtney
Subtitles Arrival (2016) subtitle poster
Arrival
2016 Movie
as Captain Marks
Subtitles Your Honor (2020) subtitle poster
Your Honor
2020 TV
as Father Jay
Subtitles Killjoys (2015) subtitle poster
Killjoys
2015 TV
as Grayson Hicks
Subtitles City on a Hill (2019) subtitle poster
City on a Hill
2019 TV
as Jimmy Ryan
Subtitles The Copenhagen Test (2025) subtitle poster
The Copenhagen Test
2025 TV
as Edmund Cobb
Subtitles Marriage Story (2019) subtitle poster
Marriage Story
2019 Movie
as Carter Mitchum
Subtitles 61st Street (2022) subtitle poster
61st Street
2022 TV
as Officer Logan
Subtitles The Sticky (2024) subtitle poster
The Sticky
2024 TV
as Charlie
Subtitles The Last Tycoon (2017) subtitle poster
The Last Tycoon
2017 TV
as Max Miner
Subtitles Bad Times at the El Royale (2018) subtitle poster
Bad Times at the El Royale
2018 Movie
as Larsen Rogers
Subtitles Kin (2018) subtitle poster
Kin
2018 Movie
as Jake
Subtitles The Darkest Minds (2018) subtitle poster
The Darkest Minds
2018 Movie
as Rob Meadows
Subtitles Anon (2018) subtitle poster
Anon
2018 Movie
as Cyrus Frear
Subtitles How It Ends (2018) subtitle poster
How It Ends
2018 Movie
as Jeremiah
Subtitles Parallel (2018) subtitle poster
Parallel
2018 Movie
as Josh
Subtitles The Front Runner (2018) subtitle poster
The Front Runner
2018 Movie
as Billy Shore
Subtitles
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