Personal Info

Known For

Acting

Known Credits

Gender

Male

Birthday

1984-05-07 (40 years old)

Place of Birth

St. Johns, Newfoundland, Canada

Also Known As

Mark O’Brien

Mark O'Brien

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).

Known For

7.6%

Arrival

Nov 10, 2016

7.7%

Marriage Story

Sep 28, 2019

7.0%

Ready or Not

Aug 21, 2019

6.8%

Bad Times at the El Royale

Oct 4, 2018

7.0%

The Darkest Minds

Jul 25, 2018

8.2%

Hannibal

Apr 4, 2013

5.3%

How It Ends

Jul 13, 2018

6.0%

Anon

May 3, 2018

8.1%

Your Honor

Dec 6, 2020

6.1%

Kin

Aug 29, 2018

7.7%

Warehouse 13

Jul 7, 2009

7.9%

Halt and Catch Fire

Jun 1, 2014

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Acting

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

2025		Shadow of God as Mason Harper
2025		Seven Veils as Paul
2025		Topper as Topper

2024

The Sticky as Charlie

2022

61st Street as Officer Logan

2021		Blue Bayou as Ace
2021		The Righteous as Aaron Smith

2020		Your Honor as Father Jay
2020		Perry Mason as Thomas Milligan

2019		Hammer as Chris Davis
2019		Marriage Story as Carter Mitchum
2019		The Kelly Clarkson Show
2019		Ready or Not as Alex Le Domas
2019		City on a Hill as Jimmy Ryan
2019		Goalie as Terry Sawchuk
2019		State Like Sleep as Darren

2018		The Front Runner as Billy Shore
2018		Bad Times at the El Royale as Larsen Rogers
2018		Kin as Jake
2018		The Darkest Minds as Rob Meadows
2018		How It Ends as Jeremiah
2018		Anon as Cyrus Frear
2018		Parallel as Josh

2017

The Last Tycoon as Max Miner

2016		Arrival as Captain Marks
2016		The Dark Stranger as Mark

2015		How to Plan an Orgy in a Small Town as Bruce Buck
2015		Killjoys as Grayson Hicks
2015		End of Days, Inc. as Jason
2015		Dennis as Dennis

2014

Halt and Catch Fire as Tom Rendon

2013

Hannibal as Randall Tier

2012

Beat Down as Michael

2010		Snarbuckled as Jacob O'Higgins
2010		Brad as Brad
2010		Republic of Doyle as Des Courtney

2009		Mum's the Word as Curtis
2009		Grown Up Movie Star as Will
2009		Quiet at Dawn as Watts
2009		Warehouse 13 as Jerry Hoffler
2009		Cut from the Same Cloth as Jack Cochrane

2008		Heartless Disappearance Into Labrador Seas as Charlie
2008		Epilogue as Henry
2008		The One That Got Away as Tommy Palchek
2008		The Four Horsemen as Eric Rollins

Directing

—

The Voices of Our Mother as Director

2021

The Righteous as Director

2016

Wanderer as Director

2011

Kathy as Director

Editing

2010

Brad as Editor

Production

2021

The Righteous as Executive Producer

2019

Goalie as Executive Producer

2015

Dennis as Producer

2010

Brad as Producer

Writing

—

The Voices of Our Mother as Writer

2021

The Righteous as Writer