Mark O’Brien

Actor, Director, Writer

Birthdate: May 7, 1984

Birthplace: St. John's, Newfoundland and Labrador, Canada

Mark O'Brien is an award-winning actor and filmmaker. He is an English major with a Bachelor of Arts from Memorial University of Newfoundland. His mother was a nurse and his father a truck driver. Mark also has three older sisters. He married actress Georgina Reilly on January 6, 2013 after meeting on the set of the hit show Republic of Doyle.

Known For

City on a Hill
City on a Hill

(2019)

Halt and Catch Fire
Halt and Catch Fire

(2014)

Mark O’Brien Movies

actor

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Previous (19)

  • 2026 |

    The Voices of Our Mother

    asWilliam
  • 2025 |

    Nuremberg

    asColonel John Amen
  • 2025 |

    Seven Veils

  • 2024 |

    Parallel

    asJosh
  • 2021 |
    The Righteousas Aaron Smith
  • 2021 |

    Blue Bayou

    asAce
  • 2019 |
    Goalieas Terry Sawchuk
  • 2019 |
    Hammeras Chris Davis
  • 2019 |

    Ready or Not

    asAlex
  • 2018 |

    The Front Runner

    asBilly Shore
  • 2018 |

    Bad Times at the El Royale

    asLarsen Rogers
  • 2018 |

    The Darkest Minds

    asRob
  • 2016 |

    Arrival

    asCaptain Marks
  • 2015 |
    End of Days, Inc.as Jason
  • 2015 |
    How to Plan an Orgy in a Small Townas Bruce Buck
  • 2015 |
    Len and Companyas Zach
  • 2015 |
    The Dark Strangeras Mark
  • 2012 |
    Beat Downas Michael
  • 2009 |
    Grown Up Movie Staras Will