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Thomas Philip O'Neill

Thomas Philip O'Neill

Known for

Acting

Biography

No biography available.

Best known work

Law & Order: Special Victims Unit

Law & Order: Special Victims Unit

1999
Black Mass

Black Mass

2015
MINDHUNTER

MINDHUNTER

2017
FBI

FBI

2018
Law & Order

Law & Order

1990
NCIS: New Orleans

NCIS: New Orleans

2014
Mapplethorpe

Mapplethorpe

2019
The School Duel

The School Duel

2024
Writer's Block

Writer's Block

2025
Endless Sea

Endless Sea

2022

Filmography

  1. 2026

    The Mix

    as Sean Palermo

  2. 2025

    Writer's Block

    as Matthew

  3. 2024

    The School Duel

    as Pastor Mark

  4. 2022

    Endless Sea

  5. 2019

    Mapplethorpe

    as David Croland

  6. 2018

    FBITV

    as Neil Mosbach (13 episodes), as Dr. Neil Mosbach (10 episodes)

  7. 2017

    MINDHUNTERTV

    as Leo Buchanan (1 episode)

  8. 2015

    Black Mass

    as FBI Wire Tech

  9. 2014

    NCIS: New OrleansTV

    as Eddie Oberman (1 episode)

  10. 1999

    Law & Order: Special Victims UnitTV

    as Rick Donnelly (1 episode)

  11. 1990

    Law & OrderTV

    as Dr. Neil Mosbach (2 episodes)

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