- His parents, Kenneth D. Greenblatt and Sandra B. Greenblatt, are noted Broadway producers. Works they produced have been Tony-nominated more than 60 times and have won more than 20 times.
- He is of Ashkenazi Jewish (father) and Swedish-Italian (mother) descent.
- Lives back in the mountains outside Manhattan with his wife Soli raising their beautiful son and daughter. (August 2007)
- He is the father of American child actress Ariana Greenblatt, who is perhaps more famous than he.
- Trained theatrically at the Stella Adler Conservatory.
- Father of Ariana Greenblatt.
- In Freddy's Dead: The Final Nightmare (1991) in particular, he bears a striking resemblance to actor Rider Strong.
- Trained theatrically under Arthur Mendoza.
- Started a music video production company with Nathan "Karma" Cox, called "Creature." (April 2002)
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