Before coming to Google, Dr. Greenblatt was High Meadows scientist at Environmental Defense Fund, where he evaluated the technical, economic and environmental aspects of a wide range of energy technologies. He developed "wedge" climate stabilization scenarios for California, the Midwest, and the US, and he was also the technical lead editor on "Earth: The Sequel," a book about the emerging clean energy field, by Fred Krupp and Miriam Horn.

He received his training in climate and energy at Princeton University, where he was on the research staff for four years, working on many projects including ocean carbon cycle modeling, the economics of wind energy and energy storage, and the development of the "wedge" climate stabilization concept with professors Robert Socolow and Stephen Pacala.

He received his Ph.D. in chemistry from the University of California, Berkeley in 1999.