Beloved father of Josh Greenstein and Lindsey Cotsonas, and son-in-law Chris Cotsonas. Survived by his ex-wife, Kathleen, his brother Wayne Greenstein and nephew Alexander. Marc grew up in Queens, NY, and went to Stony Brook University, and received a masters at Syracuse University. Marc was a Commodity Trader in Gold, Coffee, and Cotton. He did Stand-up comedy in NYC, and wrote a joke book called Jokes my Mother Never Told Me . He belonged to Mensa and loved watching movies and Jeopardy, even appearing on trivia gameshows. He made people laugh and had a joke for every occasion. In lieu of flowers, Marc was a big supporter of St. Jude Children's Research Hospital – www.stjude.org