Joel is a co-founder of several energy technology companies including Foro Energy, Biota Technology, and Rho AI. He is a Founding Investor and Board Member of Rubicon Global and Zero Mass Water, and an angel investor in over 30 early stage technology companies. He actively invests from a small institutional fund into pre-seed, seed, and Series A financing rounds. Joel is also on the team of Breakthrough Energy Ventures, supporting the Breakthrough Energy Coalition in providing long-term capital for sustainable energy technologies.

Joel is a Precourt Energy Scholar and Adjunct Professor at Stanford University. Joel received his B.S.E in Chemical Engineering from Princeton University, and his Ph.D. in Chemical Engineering from Massachusetts Institute for Technology.