Peter is a founder and Managing Director of NGEN Partners. Peter has over 30 years of experience as an entrepreneur, operating executive, venture and financial investor. He founded NGEN in 2001 out of a deep conviction that resource scarcity and energy efficiency would be drivers of technology innovation in the 21st century; and that those innovations could be built into some of the most successful companies of the next generation. He has grown the firm from one of the earliest to invest in clean technologies, to a three-fund family.

Peter has had successful investment exits in Renaissance Lighting, Textronics, U.S. Labs, AnaServe, Carolina Steel, Premiere Video and Kenfil. Prior to NGEN, Peter made diverse private investments, ranging from leveraged buyouts and leveraged recapitalizations to early venture investments in materials science. He gained early career experience as an executive in a global manufacturing firm, working in Germany as well as the United States.

Peter is currently a member of the Board of Directors of Brightfarms, eIQ Energy, Hycrete and Renewable Funding. He maintains a close relationship with the Materials Science Department at UC Santa Barbara, and was instrumental in bringing Nobel Prize winner Alan J. Heeger and other noted scientists as Venture Partners to NGEN.

Grubstein is a graduate of Yale University and the Phillips Exeter Academy. He is an avid outdoorsman, and lives in California and Connecticut.