Thomas Philip O'Neill

Thomas Philip O'Neill

Acting

Known for

Law & Order: Special Victims Unit

Law & Order: Special Victims Unit

1999

Law & Order

Law & Order

1990

FBI

FBI

2018

FBI

FBI

2018

NCIS: New Orleans

NCIS: New Orleans

2014

MINDHUNTER

MINDHUNTER

2017

Black Mass

Black Mass

2015

Mapplethorpe

Mapplethorpe

2019

Acting(11)

2026The MixSean Palermo

2025Writer's BlockMatthew

2024The School DuelPastor Mark

Thomas Philip O'Neill — Watchpile | Watchpile

2022Endless Sea

2019MapplethorpeDavid Croland

2018FBINeil Mosbach

2017MINDHUNTERLeo Buchanan

2015Black MassFBI Wire Tech

2014NCIS: New OrleansEddie Oberman

1999Law & Order: Special Victims UnitRick Donnelly

1990Law & OrderDr. Neil Mosbach