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).

Career Overview

Mark O'Brien has 78 screen credits in a career dating back to 2008. Their work is anchored in the Ready or Not Collection universe with 1 titles. Signature works include Ready or Not, Arrival, The Outer Threat. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.

Personal Facts

Known For: Acting
Gender: male
Known Credits: 78
Birth Date: 1984-05-07 00:00:00
Birth Place: St. Johns, Newfoundland, Canada

Known For

Associated Universes

Ready or Not Collection (1 titles)

Frequent Collaborators

James Vanderbilt (5 collaborations)
Jóhann Jóhannsson (4 collaborations)
Brian Tyler (3 collaborations)
Réjean Goderre (3 collaborations)
Michael Babcock (3 collaborations)
Adam Tupper (2 collaborations)
Adam Winlove-Smith (2 collaborations)
James Eddy (2 collaborations)
Bradley J. Fischer (2 collaborations)
William Sherak (2 collaborations)

Credits

actors (53 credits)
- The Outer Threat
  
  actor
  
  actors
  
  2026
- Better People
  John
  
  actor
  
  actors
  
  2026
- Nice People
  
  actor
  
  actors
  
  2026
- Good in the Room
  Charlie
  
  actor
  
  actors
  
  2026
- Little One
  
  actor
  
  actors
  
  2026
- The Voices of Our Mother
  William
  
  actor
  
  actors
  
  2026
- The Copenhagen Test
  Edmund Cobb
  
  actor
  
  actors
  
  - Episode 2 () ... Cobb actor actors
  
  - Episode 1 (2025) ... Cobb actor actors
  
  2025
- Nuremberg
  Colonel John Amen
  
  actor
  
  actors
  
  2025
- The Memory Keeper
  Elizeus Carrier
  
  actor
  
  actors
  
  2025
- Shadow of God
  Mason Harper
  
  actor
  
  actors
  
  2025
- Seven Veils
  Paul
  
  actor
  
  actors
  
  2025
- Topper
  Topper
  
  actor
  
  actors
  
  2025
- The Sticky
  
  - Insertion Point (2024) ... Charlie actor actors
  
  2024
- Blue Bayou
  Ace
  
  actor
  
  actors
  
  2021
- The Righteous
  Aaron Smith
  
  actor
  
  actors
  
  2021
- Your Honor
  
  - Part Twenty (2023) ... Father Jay actor actors
  
  - Part Seventeen (2023) ... Father Jay actor actors
  
  - Part Sixteen (2023) ... Father Jay actor actors
  
  2020
- Perry Mason
  
  - Chapter Sixteen (2023) ... Thomas Milligan actor actors
  
  - Chapter Fifteen (2023) ... Thomas Milligan actor actors
  
  - Chapter Fourteen (2023) ... Thomas Milligan actor actors
  
  - Chapter Thirteen (2023) ... Thomas Milligan actor actors
  
  - Chapter Twelve (2023) ... Thomas Milligan actor actors
  
  2020
- Hammer
  Chris Davis
  
  actor
  
  actors
  
  2019
- Marriage Story
  Carter Mitchum
  
  actor
  
  actors
  
  2019
- Ready or Not
  Alex
  
  actor
  
  actors
  
  2019
- Goalie
  Terry Sawchuk
  
  actor
  
  actors
  
  2019
- State Like Sleep
  Darren
  
  actor
  
  actors
  
  2019
- City on a Hill
  
  - Mayor Curley and the Last Hurrah (2019) ... Jimmy Ryan actor actors
  
  - The Deaf Sage of Pompeii (2019) ... Jimmy Ryan actor actors
  
  - High on the Looming Gallows Tree (2019) ... Jimmy Ryan actor actors
  
  - There Are No F**king Sides (2019) ... Jimmy Ryan actor actors
  
  - It's Hard to Be a Saint in the City (2019) ... Jimmy Ryan actor actors
  
  2019
- The Kelly Clarkson Show
  
  - Idina Menzel, Talia Suskauer & Craig Wich, Mark O'Brien, Barlow & Bear (2022) ... Self actor actors
  
  2019
- The Front Runner
  Billy Shore
  
  actor
  
  actors
  
  2018
- Bad Times at the El Royale
  Larsen Rogers
  
  actor
  
  actors
  
  2018
- Kin
  Jake
  
  actor
  
  actors
  
  2018
- The Darkest Minds
  Rob Meadows
  
  actor
  
  actors
  
  2018
- How It Ends
  Jeremiah
  
  actor
  
  actors
  
  2018
- Anon
  Cyrus Frear
  
  actor
  
  actors
  
  2018
- Parallel
  Josh
  
  actor
  
  actors
  
  2018
- Arrival
  Captain Marks
  
  actor
  
  actors
  
  2016
- Wanderer
  Eric
  
  actor
  
  actors
  
  2016
- The Dark Stranger
  Mark
  
  actor
  
  actors
  
  2016
- How to Plan an Orgy in a Small Town
  Bruce Buck
  
  actor
  
  actors
  
  2015
- End of Days, Inc.
  Jason
  
  actor
  
  actors
  
  2015
- Dennis
  Dennis
  
  actor
  
  actors
  
  2015
- Killjoys
  
  - Kiss Kiss, Bye Bye (2015) ... Grayson Hicks actor actors
  
  2015
- Halt and Catch Fire
  
  - Nowhere Man (2017) ... Tom Rendon actor actors
  
  - Miscellaneous (2017) ... Tom Rendon actor actors
  
  - NeXT (2016) ... Tom Rendon actor actors
  
  - You Are Not Safe (2016) ... Tom Rendon actor actors
  
  - The Threshold (2016) ... Tom Rendon actor actors
  
  2014
- Sweetieface
  Sam
  
  actor
  
  actors
  
  2013
- Hannibal
  
  - Naka-Choko (2014) ... Randall Tier actor actors
  
  - Shiizakana (2014) ... Randall Tier actor actors
  
  2013
- Beat Down
  Michael
  
  actor
  
  actors
  
  2012
- Snarbuckled
  Jacob O'Higgins
  
  actor
  
  actors
  
  2010
- Brad
  Brad
  
  actor
  
  actors
  
  2010
- Grown Up Movie Star
  Will
  
  actor
  
  actors
  
  2010
- Mum's the Word
  Curtis
  
  actor
  
  actors
  
  2009
- Quiet at Dawn
  Watts
  
  actor
  
  actors
  
  2009
- Cut from the Same Cloth
  Jack Cochrane
  
  actor
  
  actors
  
  2009
- Warehouse 13
  
  - Don't Hate the Player (2011) ... Jerry Hoffler actor actors
  
  2009
- Heartless Disappearance Into Labrador Seas
  Charlie
  
  actor
  
  actors
  
  2008
- Epilogue
  Henry
  
  actor
  
  actors
  
  2008
- The One That Got Away
  Tommy Palchek
  
  actor
  
  actors
  
  2008
- The Four Horsemen
  Eric Rollins
  
  actor
  
  actors
  
  2008
writing (5 credits)
- Better People
  
  writer
  
  writing
  
  2026
- Good in the Room
  
  writer
  
  writing
  
  2026
- The Voices of Our Mother
  
  writer
  
  writing
  
  2026
- The Righteous
  
  writer
  
  writing
  
  2021
- Pretty Girls
  
  writer
  
  writing
  
  2008
editing (4 credits)
- Better People
  
  editor
  
  editing
  
  2026
- Sweetieface
  
  editor
  
  editing
  
  2013
- Brad
  
  editor
  
  editing
  
  2010
- Pretty Girls
  
  editor
  
  editing
  
  2008
directing (8 credits)
- Better People
  
  director
  
  directing
  
  2026
- Nice People
  
  director
  
  directing
  
  2026
- The Voices of Our Mother
  
  director
  
  directing
  
  2026
- The Righteous
  
  director
  
  directing
  
  2021
- Wanderer
  
  director
  
  directing
  
  2016
- Sweetieface
  
  director
  
  directing
  
  2013
- Kathy
  
  director
  
  directing
  
  2011
- Pretty Girls
  
  director
  
  directing
  
  2008
production (7 credits)
- Good in the Room
  
  executive producer
  
  production
  
  2026
- The Righteous
  
  executive producer
  
  production
  
  2021
- Goalie
  
  executive producer
  
  production
  
  2019
- Wanderer
  
  producer
  
  production
  
  2016
- Dennis
  
  producer
  
  production
  
  2015
- Sweetieface
  
  producer
  
  production
  
  2013
- Brad
  
  producer
  
  production
  
  2010
crew (1 credits)
- Pretty Girls
  
  cinematography
  
  crew
  
  2008