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.
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.