His credits include Camouflage, Word for Word, Let's Play Post Office, Reach for the Stars, Dream House, Sale of the Century, The Money Maze, The Joker's Wild, Tic-Tac-Dough, Hollywood Connection, Play the Percentages, Bullseye, and Greed.
He packaged five games: The Who, What or Where Game (1969-1974), The Big Showdown (1974-1975), The Pop 'N Rocker Game (1983-1984), a remake of The Who, What, or Where Game titled The Challengers (1990-1991) and a remake of Let's Make a Deal (1990-1991).
Greenberg created and hosted a weekly quiz radio show on Shokus Internet Radio titled Anyone Can Play ... But Don't Call Us, We'll Call You. However, Greenberg has since relinquished hosting duties to game show veteran Larry Anderson.
- David Schwartz, Steve Ryan and Fred Wostbrock, The Encyclopedia of TV Game Shows, Third edition (New York: Checkmark Books, 1999) ISBN 0-8160-3847-3