John began his film and television career in the late seventies and has hundreds of acting roles under his belt and his first role was in the soap opera Ryan's Hope. He went on to appear in such shows as The Equalizer, Moonlighting, Murphy Brown, Law and Order, NYPD Blue, The west Wing, Dragnet, CSI: Crime Scene Investigation, Seinfeld and a host of others.
He has just as many film roles under his belt, most notable as Sgt. Aguado in Ace Ventura: Pet Detective. He's also been in Wall Street, Independence Day, Naked Gun 33 1/3, Jacob's Ladder, Gremlins 2, See No Evil - Hear No Evil, Speed and many more to numerous to list.