Greenblatt started as real estate Lawyer for the New York law firm, Fried, Frank, Harris, Shriver & Jacobson. In the mid-1990s, he started a cappuccino coffee company, with pod machines at Penn Station and the New York City airports, but following the rise of Starbucks, sold his Business and returned to practicing law. Greenblatt is the creator of the blog Inspire Conversation, a collection of resources for parents and teens, as well as the author of three travel books, one about a family trip to Israel.