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Recent Release
The Outer Threat
Jul 24, 2026 Movie
Mark O'Brien

Mark O'Brien

Acting
Born May 07, 1984 (42 years old)
Place of Birth St. Johns, Newfoundland, Canada
Gender Male
Popularity 1.4
IMDb View on IMDb

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).
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).

Credits

Arrival
Arrival
2016 7.6
Captain Marks
Arrival
Nov 10, 2016
Captain Marks
7.6/10
 Ready or Not
Ready or Not
2019 7.1
Alex
Ready or Not
Aug 21, 2019
Alex
7.1/10
 Marriage Story
Marriage Story
2019 7.7
Carter Mitchum
Marriage Story
Sep 28, 2019
Carter Mitchum
7.7/10
 Nuremberg
Nuremberg
2025 7.6
Colonel John Amen
Nuremberg
Nov 6, 2025
Colonel John Amen
7.6/10
 Bad Times at the El Royale
Bad Times at the El Royale
2018 6.8
Larsen Rogers
Bad Times at the El Royale
Oct 4, 2018
Larsen Rogers
6.8/10
 The Darkest Minds
The Darkest Minds
2018 7
Rob Meadows
The Darkest Minds
Jul 25, 2018
Rob Meadows
7/10
 How It Ends
How It Ends
2018 5.3
Jeremiah
How It Ends
Jul 13, 2018
Jeremiah
5.3/10
 Seven Veils
Seven Veils
2025 5.5
Paul
Seven Veils
Mar 7, 2025
Paul
5.5/10
 Kin
Kin
2018 6.1
Jake
Kin
Aug 29, 2018
Jake
6.1/10
 The Front Runner
The Front Runner
2018 5.9
Billy Shore
The Front Runner
Nov 6, 2018
Billy Shore
5.9/10
 Shadow of God
Shadow of God
2025 5.6
Mason Harper
Shadow of God
Mar 26, 2025
Mason Harper
5.6/10
 Anon
Anon
2018 6
Cyrus Frear
Anon
May 3, 2018
Cyrus Frear
6/10
 Parallel
Parallel
2018 6
Josh
Parallel
Apr 10, 2018
Josh
6/10
 How to Plan an Orgy in a Small Town
How to Plan an Orgy in a Small Town
2015 5.1
Bruce Buck
How to Plan an Orgy in a Small Town
Sep 19, 2015
Bruce Buck
5.1/10
 Blue Bayou
Blue Bayou
2021 7.4
Ace
Blue Bayou
Sep 10, 2021
Ace
7.4/10
 The Outer Threat
The Outer Threat
2026 5.5
Daniel Ashford
The Outer Threat
Jul 24, 2026
Daniel Ashford
5.5/10
 The Four Horsemen
The Four Horsemen
2008 6
Eric Rollins
The Four Horsemen
Mar 18, 2008
Eric Rollins
6/10
 Grown Up Movie Star
Grown Up Movie Star
2010 5.1
Will
Grown Up Movie Star
Jan 29, 2010
Will
5.1/10
Cut from the Same Cloth
2009
Jack Cochrane
Cut from the Same Cloth
Jan 1, 2009
Jack Cochrane
 Heartless Disappearance Into Labrador Seas
Heartless Disappearance Into Labrador Seas
2008
Charlie
Heartless Disappearance Into Labrador Seas
Sep 9, 2008
Charlie
 Snarbuckled
Snarbuckled
2010
Jacob O'Higgins
Snarbuckled
Sep 18, 2010
Jacob O'Higgins
 The Dark Stranger
The Dark Stranger
2016 4.9
Mark
The Dark Stranger
Jul 15, 2016
Mark
4.9/10
 End of Days, Inc.
End of Days, Inc.
2015 5.8
Jason
End of Days, Inc.
Apr 24, 2015
Jason
5.8/10
 The Voices of Our Mother
The Voices of Our Mother
2026 6.4
William
The Voices of Our Mother
Jun 5, 2026
William
6.4/10
 Beat Down
Beat Down
2012
Michael
Beat Down
Aug 3, 2012
Michael
 State Like Sleep
State Like Sleep
2019 4.6
Darren
State Like Sleep
Jan 4, 2019
Darren
4.6/10
 Goalie
Goalie
2019 6.8
Terry Sawchuk
Goalie
Mar 1, 2019
Terry Sawchuk
6.8/10
 Hammer
Hammer
2019 5.5
Chris Davis
Hammer
Dec 5, 2019
Chris Davis
5.5/10
 The Righteous
The Righteous
2021 6.3
Aaron Smith
The Righteous
Aug 15, 2021
Aaron Smith
6.3/10
 Dennis
Dennis
2015
Dennis
Dennis
Apr 18, 2015
Dennis
 The Memory Keeper
The Memory Keeper
2025 7
Elizeus Carrier
The Memory Keeper
Oct 26, 2025
Elizeus Carrier
7/10
Mum's the Word
2009
Curtis
Mum's the Word
Oct 23, 2009
Curtis
Epilogue
2008
Henry
Epilogue
Jun 27, 2008
Henry
Brad
2010
Brad
Brad
Jul 24, 2010
Brad
Quiet at Dawn
2009
Watts
Quiet at Dawn
Sep 1, 2009
Watts
 Topper
Topper
2025 5.3
Topper
Topper
Mar 4, 2025
Topper
5.3/10
 The One That Got Away
The One That Got Away
2008 4.3
Tommy Palchek
The One That Got Away
Apr 20, 2008
Tommy Palchek
4.3/10
Better People
John
Better People
John
 Little One
Little One
Little One
Sweetieface
2013
Sam
Sweetieface
Jan 1, 2013
Sam
 Wanderer
Wanderer
2016 5
Eric
Wanderer
Oct 4, 2016
Eric
5/10
Nice People
Nice People
Good in the Room
Charlie
Good in the Room
Charlie
Soma
Paul
Soma
Paul
The Kelly Clarkson Show
The Kelly Clarkson Show
2019 1 eps 6.2
Self
The Kelly Clarkson Show
Sep 9, 2019
Self
1 episodes
 Warehouse 13
Warehouse 13
2009 1 eps 7.7
Jerry Hoffler
Warehouse 13
Jul 7, 2009
Jerry Hoffler
1 episodes
 Hannibal
Hannibal
2013 2 eps 8.3
Randall Tier
Hannibal
Apr 4, 2013
Randall Tier
2 episodes
 Halt and Catch Fire
Halt and Catch Fire
2014 15 eps 7.9
Tom Rendon
Halt and Catch Fire
Jun 1, 2014
Tom Rendon
15 episodes
 Killjoys
Killjoys
2015 1 eps 6.9
Grayson Hicks
Killjoys
Jun 19, 2015
Grayson Hicks
1 episodes
 Perry Mason
Perry Mason
2020 7 eps 7.2
Thomas Milligan
Perry Mason
Jun 21, 2020
Thomas Milligan
7 episodes
 Republic of Doyle
Republic of Doyle
2010 77 eps 7
Des Courtney
Republic of Doyle
Jan 6, 2010
Des Courtney
77 episodes
 Your Honor
Your Honor
2020 3 eps 8
Father Jay
Your Honor
Dec 6, 2020
Father Jay
3 episodes
 City on a Hill
City on a Hill
2019 14 eps 7.3
Jimmy Ryan
City on a Hill
Jun 16, 2019
Jimmy Ryan
14 episodes
 61st Street
61st Street
2022 8 eps 6.2
Officer Logan
61st Street
Apr 10, 2022
Officer Logan
8 episodes
 The Copenhagen Test
The Copenhagen Test
2025 8 eps 6.6
Edmund Cobb
The Copenhagen Test
Dec 27, 2025
Edmund Cobb
8 episodes
 The Sticky
The Sticky
2024 1 eps 7.2
Charlie
The Sticky
Dec 6, 2024
Charlie
1 episodes
 The Last Tycoon
The Last Tycoon
2017 9 eps 7
Max Miner
The Last Tycoon
Jul 28, 2017
Max Miner
9 episodes
Stillwater
Deputy Ted Keegan
Stillwater
Deputy Ted Keegan
Pretty Girls
2008
Director
Pretty Girls
Jun 25, 2008
Director
Pretty Girls
2008
Writer
Pretty Girls
Jun 25, 2008
Writer
Pretty Girls
2008
Editor
Pretty Girls
Jun 25, 2008
Editor
Pretty Girls
2008
Cinematography
Pretty Girls
Jun 25, 2008
Cinematography
 The Righteous
The Righteous
2021 6.3
Director
The Righteous
Aug 15, 2021
Director
 The Righteous
The Righteous
2021 6.3
Writer
The Righteous
Aug 15, 2021
Writer
 The Righteous
The Righteous
2021 6.3
Executive Producer
The Righteous
Aug 15, 2021
Executive Producer
 Wanderer
Wanderer
2016 5
Director
Wanderer
Oct 4, 2016
Director
 The Voices of Our Mother
The Voices of Our Mother
2026 6.4
Director
The Voices of Our Mother
Jun 5, 2026
Director
 The Voices of Our Mother
The Voices of Our Mother
2026 6.4
Writer
The Voices of Our Mother
Jun 5, 2026
Writer
 Goalie
Goalie
2019 6.8
Executive Producer
Goalie
Mar 1, 2019
Executive Producer
 Kathy
Kathy
2011
Director
Kathy
Sep 17, 2011
Director
Brad
2010
Producer
Brad
Jul 24, 2010
Producer
Brad
2010
Editor
Brad
Jul 24, 2010
Editor
 Dennis
Dennis
2015
Producer
Dennis
Apr 18, 2015
Producer
Better People
Director
Better People
Director
Better People
Writer
Better People
Writer
Better People
Editor
Better People
Editor
Sweetieface
2013
Director
Sweetieface
Jan 1, 2013
Director
Sweetieface
2013
Producer
Sweetieface
Jan 1, 2013
Producer
Sweetieface
2013
Editor
Sweetieface
Jan 1, 2013
Editor
 Wanderer
Wanderer
2016 5
Producer
Wanderer
Oct 4, 2016
Producer
Nice People
Director
Nice People
Director
Good in the Room
Writer
Good in the Room
Writer
Good in the Room
Executive Producer
Good in the Room
Executive Producer

Gallery

Mark O'Brien
Mark O'Brien
Mark O'Brien
Mark O'Brien
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