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IMDbPro

John T. O'Brien(II)

  • Actor
  • Writer
  • Composer
IMDbProStarmeterSee rank
John T. O'Brien
Watch John T. O'Brien Commercial Reel
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John T. O'Brien Commercial Reel
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John T. O'Brien is an American actor, writer and musician best known for his roles on the TV series Chicago Fire (NBC), No Apologies (Fox) and In An Instant (ABC). He wrote, executive produced and starred in Dad Man Walking, an original pilot for television directed by Clare Cooney. He was born in Chicago where he studied acting and improvisation.
  • More at IMDbPro
    • Contact info
    • Agent info
    • Resume
IMDbProStarmeterSee rank
  • View contact info at IMDbPro
    • Awards
      • 1 win total

    Photos43

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    Known for

    Ella Beatty in Monster (2022)
    Monster
    7.7
    TV Series
    • Ted Bundy
    Terrence Howard and Taraji P. Henson in Empire (2015)
    Empire
    7.4
    TV Series
    • Fox Exec One
    John T. O'Brien in Dad Man Walking
    Dad Man Walking
    TV Movie
    • Johnny
      Dermot Mulroney, David Eigenberg, Christian Stolte, Hanako Greensmith, Taylor Kinney, Joe Minoso, Miranda Rae Mayo, and Jocelyn Hudon in Chicago Fire (2012)
      Chicago Fire
      8.0
      TV Series
      • Male Doctor

      Credits

      IMDbPro

      Actor

      • Skate or Die (2025)
        Skate or Die
        Short
        • Henderson
        • 2025
      • Ella Beatty in Monster (2022)
        Monster
        7.7
        TV Series
        • Ted Bundy
        • 2025
      • Superhuman Public Radio (2020)
        Superhuman Public Radio
        Podcast Series
        • Captain Phasmic
        • 2020
      • Theo Koppel, Reid Estreicher, Meghan Murphy, Stevie Shale, Timmy Carroll, Richard Kallus, John T. O'Brien, Jason Amplo, Michael Barnard, Phylicia McLeod, Emily Zawisza, Jodie Meis, and Alex Solomon in Thank You 5 (2020)
        Thank You 5
        8.7
        • Scot Stevans
        • 2020
      • Terrence Howard and Taraji P. Henson in Empire (2015)
        Empire
        7.4
        TV Series
        • Fox Exec One
        • 2019
      • Computer Hackers (2019)
        Computer Hackers
        6.8
        • Rick
        • 2019
      • No Apologies (2018)
        No Apologies
        6.2
        TV Movie
        • Desk Clerk Michael
        • 2018
      • Harry Lennix, Walt Sloan, Brian Barber, Shannon Brown, and Jennifer A. Goodman in Conrad (2018)
        Conrad
        6.4
        TV Series
        • Detective Pete Hunt
        • 2018
      • Dermot Mulroney, David Eigenberg, Christian Stolte, Hanako Greensmith, Taylor Kinney, Joe Minoso, Miranda Rae Mayo, and Jocelyn Hudon in Chicago Fire (2012)
        Chicago Fire
        8.0
        TV Series
        • Male Doctor
        • 2018
      • Super Narcoleptic Girl (2018)
        Super Narcoleptic Girl
        5.6
        TV Series
        • Dave
        • 2018
      • Waiting on Roxie (2016)
        Waiting on Roxie
        7.4
        Short
        • Crewman
        • 2016
      • Dogwalker (2016)
        Dogwalker
        6.0
        Short
        • Handsome Man on Train
        • 2016
      • Chi City Dreamzzz
        TV Series
        • Max
        • 2015
      • In an Instant (2015)
        In an Instant
        6.6
        TV Series
        • Detective Schmaling
        • 2015
      • The Denim Warrior
        Short
        • The Denim Warrior
        • 2014

      Writer

      • The Denim Warrior
        Short
        • Writer
        • 2014

      Composer

      • Pretty Bird (2025)
        Pretty Bird
        Short
        • composer
        • 2025

      Verified affiliations

      Learn more at IMDbPro
      SAG-AFTRA

      Videos5

      Theatrical Reel 2019
      Demo Reel 2:31
      Theatrical Reel 2019
      John T. O'Brien Commercial Reel
      Demo Reel 2:12
      John T. O'Brien Commercial Reel
      John T. O'Brien Commercial Reel
      Demo Reel 2:12
      John T. O'Brien Commercial Reel
      John T. O'Brien Theatrical Reel
      Demo Reel 2:01
      John T. O'Brien Theatrical Reel
      The Onion presents---The Pizzarette
      Demo Reel 1:32
      The Onion presents---The Pizzarette
      In An Instant ABC
      Demo Reel 0:31
      In An Instant ABC

      Personal details

      • Height
        • 6′ 1″ (1.85 m)

      Self-verified on IMDbPro

      • Gender / Gender identity
        • Male

      Did you know

      • Trivia
        He attended St. Ignatius College Prep and also trained at the Second City Conservatory and iO in Chicago.

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