Acting
Mark O'Brien
Birth Date
May 7, 1984
(42 years old)
Place of Birth
St. Johns, Newfoundland, Canada
Popularity
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Biography
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).
Photos
The Kelly Clarkson Show
Self
2019 • 1 episode
Warehouse 13
Jerry Hoffler
2009 • 1 episode
Hannibal
Randall Tier
2013 • 2 episodes
Arrival
Captain Marks
2016
Republic of Doyle
Des Courtney
2010 • 77 episodes
Killjoys
Grayson Hicks
2015 • 1 episode
Halt and Catch Fire
Tom Rendon
2014 • 15 episodes
Perry Mason
Thomas Milligan
2020 • 7 episodes
Ready or Not
Alex
2019
Your Honor
Father Jay
2020 • 3 episodes
Nuremberg
Colonel John Amen
2025
City on a Hill
Jimmy Ryan
2019 • 14 episodes
Marriage Story
Carter Mitchum
2019
Bad Times at the El Royale
Larsen Rogers
2018
The Copenhagen Test
Edmund Cobb
2025 • 8 episodes
The Darkest Minds
Rob Meadows
2018
61st Street
Officer Logan
2022 • 8 episodes
The Front Runner
Billy Shore
2018
How It Ends
Jeremiah
2018
The Last Tycoon
Max Miner
2017 • 9 episodes