Mr. Hoffman is a Managing Director of Riverstone Holdings LLC, where he is principally responsible for investments in power and renewable energy for Riverstone’s funds. Mr. Hoffman is co-head of Riverstone’s Renewable Energy Funds I and II, with equity capital commitments of approximately $5 billion.

Before joining Riverstone in 2003, Mr. Hoffman was senior managing director and head of the mergers and acquisitions advisory business of The Blackstone Group for 15 years, where he also served on the firm’s principal group investment committee as well as its executive committee. Prior to joining Blackstone, Mr. Hoffman was managing director and co-head of the mergers and acquisitions department at Smith Barney, Harris Upham & Co.

Mr. Hoffman serves on the boards of Topaz Power, Bottle Rock Power, Intrinergy Geothermal, North Carolina Energy, Green Earth Fuels, CNAA, Amaizeingly Green, Emerald Clean Power, Re-Energy, AES Solar and Pattern Energy.

Mr. Hoffman also is a co-author of the recently released book, GREEN. He is also Chairman of Onconova Therapeutics, an oncology company. His non-profit board affiliations include those of Lenox Hill Hospital, Manhattan Eye, Ear and Throat Hospital and the Municipal Art Society.

Mr. Hoffman received his B.A. and M.A. from Northwestern University and his M.B.A. from the Harvard Business School.