Conversation so far:
Did Paddy Chayefsky have a television career?
Paddy Chayefsky was one of the most renowned dramatists of the Golden Age of Television.
What roles did Paddy Chayefsky play?
Paddy Chayefsky was involved in all casting decisions for the television play Marty and had a cameo role, playing one of Marty's friends, unseen, in a car.

Question: Did he do any other ones?
Self-contained rewrite: Did Paddy Chayefsky do any other roles besides his cameo role in the television play Marty?