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.

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Charlie Hunnam and Brian Cipriano in Monster (2022)

Terrence Howard and Taraji P. Henson in Empire (2015)

David Eigenberg, Christian Stolte, Hanako Greensmith, Taylor Kinney, Joe Minoso, Miranda Rae Mayo, and Jocelyn Hudon in Chicago Fire (2012)

John T. O'Brien(II)

John T. O'Brien(II)

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