William B. Rosenzweig is the Co-Founder and Managing Partner of Physic Ventures. See sector focus and contact routes.
William B. Rosenzweig is the Co-Founder and Managing Partner of Physic Ventures, a San Francisco-based venture capital firm he established in 2006 to invest in health and sustainable living. His investment thesis targets consumer-facing businesses in emerging sectors such as healthy food, food technology, the quantified self, re-commerce, IoT, and green materials, with a focus on companies that prevent disease or promote consumer-driven health. Physic Ventures typically leads investments in early-stage companies, though specific check sizes and follow/lead behavior are not publicly detailed in available sources. Notable portfolio companies include Yummly, T2 Biosystems, Gazelle, Novomer, WaterSmart Software, Consumer Physics, Own Products, On-Q-ity, and Recyclebank. Rosenzweig distinguishes himself as the first venture investor to dedicate a firm solely to “keeping people healthy,” and he was honored with the 2010 Oslo Business for Peace Award for ethical business accomplishments. Before founding Physic, he helped build over 20 companies including Odwalla and The Republic of Tea, and taught Social Entrepreneurship at UC Berkeley’s Haas School of Busines
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