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
Warehouse 13
Warehouse 13
2009 · TV
as Jerry Hoffler
Hannibal
Hannibal
2013 · TV
as Randall Tier
Arrival
Arrival
2016 · Movie
as Captain Marks
Perry Mason
Perry Mason
2020 · TV
as Thomas Milligan
Republic of Doyle
Republic of Doyle
2010 · TV
as Des Courtney
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
Ready or Not
Ready or Not
2019 · Movie
as Alex
City on a Hill
City on a Hill
2019 · TV
as Jimmy Ryan
Nuremberg
Nuremberg
2025 · Movie
as Colonel John Amen
Marriage Story
Marriage Story
2019 · Movie
as Carter Mitchum
61st Street
61st Street
2022 · TV
as Officer Logan
The Copenhagen Test
The Copenhagen Test
2025 · TV
as Edmund Cobb
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
The Sticky
The Sticky
2024 · TV
as Charlie
How It Ends
How It Ends
2018 · Movie
as Jeremiah
The Front Runner
The Front Runner
2018 · Movie
as Billy Shore
Anon
Anon
2018 · Movie
as Cyrus Frear
The Outer Threat
The Outer Threat
2026 · Movie
as Daniel Ashford
Blue Bayou
Blue Bayou
2021 · Movie
as Ace