Mark O'Brien

Person

Mark O'Brien

Acting 42 May 7, 1984

St. Johns, Newfoundland, Canada

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 Ca…

IMDb

Known for

Popular titles

Arrival

Arrival

7.6 2016 Movie
Marriage Story

Marriage Story

7.7 2019 Movie
Ready or Not

Ready or Not

7.1 2019 Movie
Bad Times at the El Royale

Bad Times at the El Royale

6.8 2018 Movie
Hannibal

Hannibal

8.3 2013 TV Show
The Kelly Clarkson Show

The Kelly Clarkson Show

6.3 2019 TV Show
The Darkest Minds

The Darkest Minds

7.0 2018 Movie
How It Ends

How It Ends

5.3 2018 Movie
Your Honor

Your Honor

8.1 2020 TV Show
Anon

Anon

6.0 2018 Movie
Nuremberg

Nuremberg

7.6 2025 Movie
Warehouse 13

Warehouse 13

7.7 2009 TV Show

Photos

More stills of Mark O'Brien

Biography

A closer look

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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

Movies and shows, newest first

  1. 2026
    The Outer Threat

    Movie Daniel Ashford

  2. 2026
    The Voices of Our Mother

    Movie William

  3. 2025
    The Copenhagen Test

    TV show Edmund Cobb

  4. 2025
    Nuremberg

    Movie Colonel John Amen

  5. 2025
    The Memory Keeper

    Movie Elizeus Carrier

  6. 2025
    Shadow of God

    Movie Mason Harper

  7. 2025
    Seven Veils

    Movie Paul

  8. 2025
    Topper

    Movie Topper

  9. 2024
    The Sticky

    TV show Charlie

  10. 2022
    61st Street

    TV show Officer Logan

  11. 2021
    Blue Bayou

    Movie Ace

  12. 2021
    The Righteous

    Movie Aaron Smith

  13. 2020
    Your Honor

    TV show Father Jay

  14. 2020
    Perry Mason

    TV show Thomas Milligan

  15. 2019
    Hammer

    Movie Chris Davis

  16. 2019
    Marriage Story

    Movie Carter Mitchum

More credits
  1. 2019
    The Kelly Clarkson Show

    TV show Self

  2. 2019
    Ready or Not

    Movie Alex

  3. 2019
    City on a Hill

    TV show Jimmy Ryan

  4. 2019
    Goalie

    Movie Terry Sawchuk

  5. 2019
    State Like Sleep

    Movie Darren

  6. 2018
    The Front Runner

    Movie Billy Shore

  7. 2018
    Bad Times at the El Royale

    Movie Larsen Rogers

  8. 2018
    Kin

    Movie Jake

  9. 2018
    The Darkest Minds

    Movie Rob Meadows

  10. 2018
    How It Ends

    Movie Jeremiah

  11. 2018
    Anon

    Movie Cyrus Frear

  12. 2018
    Parallel

    Movie Josh

  13. 2017
    The Last Tycoon

    TV show Max Miner

  14. 2016
    Arrival

    Movie Captain Marks

  15. 2016
    Wanderer

    Movie Eric

  16. 2016
    The Dark Stranger

    Movie Mark

  17. 2015
    How to Plan an Orgy in a Small Town

    Movie Bruce Buck

  18. 2015
    Killjoys

    TV show Grayson Hicks

  19. 2015
    End of Days, Inc.

    Movie Jason

  20. 2015
    Dennis

    Movie Dennis

  21. 2014
    Halt and Catch Fire

    TV show Tom Rendon

  22. 2013
    Hannibal

    TV show Randall Tier

  23. 2013
    Sweetieface

    Movie Sam

  24. 2012
    Beat Down

    Movie Michael