John Mainieri is an actor.
Blue Bloods
2010 · Father Duff
Boardwalk Empire
2010 · Hotel Manager
The Leftovers
2014 · Croupier
Cars 2
2011 · J. Curby Gremlin (voice)
Instinct
2018 · Det. Jimmy Marino
Trainwreck
2015 · Mob Bar Bartender (uncredited)
Meet Dave
2008 · Middle-Aged Man
When in Rome
2010 · Man in Elevator
Wonder Wheel
2017 · John
The Normal Heart
2014 · John
Cayman Went
2009 · Hans Kopechne
