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Mark O'Brien(IX)

  • Actor
  • Director
  • Writer
IMDbProStarmeterSee rank
Mark O'Brien
An astrophysicist's alien discovery forces him and his family to flee their home, chased by a mysterious pursuer. Their escape tests the limits between cosmic truth and paranoia.
Play trailer1:59
The Outer Threat (2026)
32 Videos
42 Photos
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.
BornMay 7
  • More at IMDbPro
    • Contact info
    • Agent info
    • Resume
BornMay 7
IMDbProStarmeterSee rank
  • View contact info at IMDbPro
    • Awards
      • 13 wins & 16 nominations total

    Photos42

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    + 37
    View Poster

    Known for

    Andie MacDowell, Henry Czerny, Adam Brody, Nicky Guadagni, John Ralston, Elyse Levesque, Melanie Scrofano, Mark O'Brien, Kristian Bruun, Samara Weaving, Daniela Barbosa, Celine Tsai, and Hanneke Talbot in Ready or Not (2019)
    Ready or Not
    6.9
    • Alex
    • 2019
    Forest Whitaker, Amy Adams, and Jeremy Renner in Arrival (2016)
    Arrival
    7.9
    • Captain Marks
    • 2016
    Kevin Bacon and Aldis Hodge in City on a Hill (2019)
    City on a Hill
    7.6
    TV Series
    • Jimmy Ryan
    Russell Crowe, Richard E. Grant, Michael Shannon, John Slattery, Leo Woodall, Rami Malek, and Mark O'Brien in Nuremberg (2025)
    Nuremberg
    7.3
    • Colonel John Amen
    • 2025

    Credits

    IMDbPro

    Actor

    • Trinity
      • Dr. Brian York
      • Filming
      • TV Series
      • 2026
    • F.A.S.T.
      • Mark Allred
      • Post-production
      • 2027
    • Soma
      • Paul
      • Filming
    • Nice People
      • Post-production
    • Little One
      • Post-production
    • Good in the Room
      • Filming
    • Callista Crowe and Constance Wu in The Outer Threat (2026)
      The Outer Threat
      4.6
      • Daniel Ashford
      • 2026
    • Sheila McCarthy in The Voices of Our Mother (2026)
      The Voices of Our Mother
      4.6
      • William
      • 2026
    • Melissa Barrera and Simu Liu in The Copenhagen Test (2025)
      The Copenhagen Test
      7.1
      TV Series
      • Edmund Cobb
      • 2025
    • Mark O'Brien in Falsehood (2025)
      Falsehood
      3.9
      • Elizeus Carrier
      • 2025
    • Russell Crowe, Richard E. Grant, Michael Shannon, John Slattery, Leo Woodall, Rami Malek, and Mark O'Brien in Nuremberg (2025)
      Nuremberg
      7.3
      • Colonel John Amen
      • 2025
    • Shadow of God (2025)
      Shadow of God
      3.9
      • Mason Harper
      • 2025
    • Topper (2025)
      Topper
      6.0
      • Topper
      • 2025
    • Margo Martindale in The Sticky (2024)
      The Sticky
      7.0
      TV Series
      • Charlie
      • 2024
    • Amanda Seyfried in Seven Veils (2023)
      Seven Veils
      5.6
      • Paul
      • 2023
    • Courtney B. Vance in 61st Street (2022)
      61st Street
      7.2
      TV Series
      • Logan
      • Johnny Logan
      • 2022–2023
    • Matthew Rhys in Perry Mason (2020)
      Perry Mason
      7.6
      TV Series
      • Thomas Milligan
      • 2023
    • Bryan Cranston in Your Honor (2020)
      Your Honor
      7.6
      TV Series
      • Father Jay
      • 2023
    • Henry Czerny, Mimi Kuzyk, and Mark O'Brien in The Righteous (2021)
      The Righteous
      6.0
      • Aaron Smith
      • 2021
    • Justin Chon and Alicia Vikander in Blue Bayou (2021)
      Blue Bayou
      7.1
      • Ace
      • 2021
    • Kevin Bacon and Aldis Hodge in City on a Hill (2019)
      City on a Hill
      7.6
      TV Series
      • Jimmy Ryan
      • 2019–2021

    Director

    • Nice People
      • Director
      • Post-production
    • Sheila McCarthy in The Voices of Our Mother (2026)
      The Voices of Our Mother
      4.6
      • Director
      • 2026
    • Henry Czerny, Mimi Kuzyk, and Mark O'Brien in The Righteous (2021)
      The Righteous
      6.0
      • Director
      • 2021
    • Threshold (2018)
      Threshold
      Short
      • Director
      • 2018
    • Reel East Coast (2015)
      Reel East Coast
      8.4
      TV Series
      • Director
      • 2015–2016
    • Wanderer (2015)
      Wanderer
      7.0
      Short
      • Director
      • 2015
    • Who Is Hannah? (2015)
      Who Is Hannah?
      Short
      • Director
      • 2015
    • Allan Hawco, Sean McGinley, and Krystin Pellerin in Republic of Doyle (2010)
      Republic of Doyle
      7.6
      TV Series
      • Director
      • 2014
    • Sweetieface (2013)
      Sweetieface
      Short
      • directed by
      • 2013
    • Better People (2012)
      Better People
      8.6
      Short
      • Director
      • 2012
    • Diary of a Deadly P.I.
      TV Series
      • Director
      • 2012
    • Kathy (2011)
      Kathy
      Short
      • directed by
      • 2011
    • Pretty Girls
      Short
      • Director
      • 2008
    • Lying Awake
      Short
      • Director
      • 2006
    • Downward Calling
      8.2
      Short
      • Director
      • 2005

    Writer

    • Good in the Room
      • Writer
      • Filming
    • Sheila McCarthy in The Voices of Our Mother (2026)
      The Voices of Our Mother
      4.6
      • Writer
      • 2026
    • Henry Czerny, Mimi Kuzyk, and Mark O'Brien in The Righteous (2021)
      The Righteous
      6.0
      • Writer
      • 2021
    • Threshold (2018)
      Threshold
      Short
      • written by
      • 2018
    • Better People (2012)
      Better People
      8.6
      Short
      • writer
      • 2012
    • Diary of a Deadly P.I.
      TV Series
      • Writer
      • 2012
    • Lying Awake
      Short
      • Writer
      • 2006
    • Downward Calling
      8.2
      Short
      • Writer
      • 2005

    Videos32

    Trailer
    Trailer 1:59
    Trailer
    Trailer
    Trailer 1:55
    Trailer
    Trailer
    Trailer 1:55
    Trailer
    Official Trailer
    Trailer 1:49
    Official Trailer
    Official Trailer
    Trailer 1:54
    Official Trailer
    Official Trailer
    Trailer 1:13
    Official Trailer
    Official Trailer
    Trailer 2:32
    Official Trailer

    Personal details

    • Official sites
      • Instagram
      • X
    • Height
      • 6′ 2½″ (1.89 m)
    • Born
      • May 7
      • St. John's, Newfoundland and Labrador, Canada
    • Spouse
      • Georgina ReillyJanuary 6, 2013 - present (1 child)
    • Children
      • Penelope Florence
    • Relatives
      • Sibling(Sibling)
    • Other works
      Host of Kids' CBC in Canada

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