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).

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Known For

The Kelly Clarkson Show

The Kelly Clarkson Show

2019

Hannibal

Hannibal

2013 • as Randall Tier

Republic of Doyle

Republic of Doyle

2010 • as Des Courtney

Warehouse 13

Warehouse 13

2009 • as Jerry Hoffler

Seven Veils

Seven Veils

2025 • as Paul

Arrival

Arrival

2016 • as Captain Marks

Filmography

2025

Seven Veils
Seven Veils
as Paul
Movie - Released: 3/7/2025
Shadow of God
Shadow of God
as Mason Harper
Movie - Released: 3/26/2025
Topper
Topper
as Topper
Movie - Released: 3/4/2025

2024

The Sticky
The Sticky
as Charlie
TV - Released: 12/6/2024

2022

61st Street
61st Street
as Officer Logan
TV - Released: 4/10/2022

2021

Blue Bayou
Blue Bayou
as Ace
Movie - Released: 9/10/2021
The Righteous
The Righteous
as Aaron Smith
Movie - Released: 8/15/2021

2020

Perry Mason
Perry Mason
as Thomas Milligan
TV - Released: 6/21/2020
Your Honor
Your Honor
as Father Jay
TV - Released: 12/6/2020

2019

State Like Sleep
State Like Sleep
as Darren
Movie - Released: 1/4/2019
Marriage Story
Marriage Story
as Carter Mitchum
Movie - Released: 9/28/2019
Goalie
Goalie
as Terry Sawchuk
Movie - Released: 3/1/2019
Hammer
Hammer
as Chris Davis
Movie - Released: 12/5/2019
Ready or Not
Ready or Not
as Alex Le Domas
Movie - Released: 8/21/2019
The Kelly Clarkson Show
The Kelly Clarkson Show
TV - Released: 9/9/2019
City on a Hill
City on a Hill
as Jimmy Ryan
TV - Released: 6/16/2019

2018

Anon
Anon
as Cyrus Frear
Movie - Released: 5/3/2018
Kin
Kin
as Jake
Movie - Released: 8/29/2018
Parallel
Parallel
as Josh
Movie - Released: 4/10/2018
The Darkest Minds
The Darkest Minds
as Rob Meadows
Movie - Released: 7/25/2018
Bad Times at the El Royale
Bad Times at the El Royale
as Larsen Rogers
Movie - Released: 10/4/2018
The Front Runner
The Front Runner
as Billy Shore
Movie - Released: 11/6/2018
How It Ends
How It Ends
as Jeremiah
Movie - Released: 7/13/2018

2017

The Last Tycoon
The Last Tycoon
as Max Miner
TV - Released: 7/28/2017

2016

The Dark Stranger
The Dark Stranger
as Mark
Movie - Released: 7/15/2016
Arrival
Arrival
as Captain Marks
Movie - Released: 11/10/2016

2015

End of Days, Inc.
End of Days, Inc.
as Jason
Movie - Released: 4/24/2015
How to Plan an Orgy in a Small Town
How to Plan an Orgy in a Small Town
as Bruce Buck
Movie - Released: 9/19/2015
Dennis
Dennis
as Dennis
Movie - Released: 4/18/2015
Killjoys
Killjoys
as Grayson Hicks
TV - Released: 6/19/2015

2014

Halt and Catch Fire
Halt and Catch Fire
as Tom Rendon
TV - Released: 6/1/2014

2013

Hannibal
Hannibal
as Randall Tier
TV - Released: 4/4/2013

2012

Beat Down
Beat Down
as Michael
Movie - Released: 8/3/2012

2010

Snarbuckled
Snarbuckled
as Jacob O'Higgins
Movie - Released: 9/18/2010
Movie
Brad
as Brad
Movie - Released: 7/24/2010
Republic of Doyle
Republic of Doyle
as Des Courtney
TV - Released: 1/6/2010

2009

Grown Up Movie Star
Grown Up Movie Star
as Will
Movie - Released: 10/20/2009
Movie
Cut from the Same Cloth
as Jack Cochrane
Movie - Released: 1/1/2009
Movie
Mum's the Word
as Curtis
Movie - Released: 10/23/2009
Movie
Quiet at Dawn
as Watts
Movie - Released: 9/1/2009
Warehouse 13
Warehouse 13
as Jerry Hoffler
TV - Released: 7/7/2009

2008

The Four Horsemen
The Four Horsemen
as Eric Rollins
Movie - Released: 3/18/2008
Heartless Disappearance Into Labrador Seas
Heartless Disappearance Into Labrador Seas
as Charlie
Movie - Released: 9/9/2008
Movie
Epilogue
as Henry
Movie - Released: 6/27/2008
The One That Got Away
The One That Got Away
as Tommy Palchek
Movie - Released: 4/20/2008

Unknown

Nuremberg
Nuremberg
as Col. John Amen
Movie
Movie
The Voices of Our Mother
as William
Movie
Movie
The Embers and the Stars
Movie
Movie
Falsehood
as Elizeus Carrier
Movie
TV
Copenhagen
as Cobb
TV