- Has appeared in five Coen Brothers films: Miller's Crossing (1990), Barton Fink (1991), The Hudsucker Proxy (1994), The Big Lebowski (1998) and The Man Who Wasn't There (2001).
- Attended Villanova University on a drama scholarship, graduating on the Dean's list. From there, he began a successful lengthy run on the New York stage both off and on Broadway.
- Was not re-hired for the second season of Homicide: Life on the Street (1993) because the network wanted to add a female cast member.
- Christopher Guest directed Jon in a commercial for the Resorts Casino Hotel in Atlantic City, New Jersey. His first Broadway job was when he was 26 years old and was hired as standby for 45-year-old Kenneth McMillan in the original production of David Mamet's "American Buffalo".
- Won the Best actor OBIE award for five different performances in the 1979/1980 off-Broadway season.
- Brother of animator and director Jack Polito.
- Originated roles in the plays "The Transfiguation of Benno Blimpie", "Gemini" and "Other People's Money".
- Was considered for the role of Captain Spaulding in House of 1000 Corpses (2003), which went to Sid Haig.
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