Mark O'Brien

Mark O'Brien

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).

Filmography

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