[3] Greenblatt started as real estate lawyer for the New York law firm, Fried, Frank, Harris, Shriver & Jacobson.

[5] 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.

[5] Greenblatt is the creator of the blog Inspire Conversation, a collection of resources for parents and teens,[8] as well as the author of three travel books, one about a family trip to Israel.

[12] In February 2020, Greenblatt joins OurCrowd, global venture investments platform, as a partner with the responsibilities of building ties in the Middle East.

[13] In 2022 In the Path of Abraham: How Donald Trump Made Peace in the Middle East by Jason Greenblatt was published.