Josh serves as Sionna’s Chair of the Board of Directors and is also a managing director at RA Capital Management. In his role as managing director, his primary focus is leading early-stage private investments and overseeing the creation of new companies developing drugs, medical devices, diagnostics and research tools. He has more than 15 years of experience in investing, company formation and company leadership across all stages of drug development, from discovery through commercialization. Josh was previously co-lead of SV Health Investors’ U.S. biotech practice where he was responsible for SV’s U.S. venture creation activities, including its incubator, Brahma Discovery. Before SV, Josh was president and managing partner at MRL Ventures Fund, the early-stage therapeutics-focused corporate venture fund within Merck & Co. Prior to MRL Ventures, Josh was a venture partner with Atlas Venture and a partner at Prism Venture Partners, focusing on company formation as well as seed and Series A investing. Josh is currently a faculty member at Harvard Medical School and continues to practice medicine as an attending physician in the department of emergency medicine at Massachusetts General Hospital. Josh received his M.D. from the University of Pennsylvania School of Medicine and MBA from The Wharton Business School at the University of Pennsylvania. He graduated with his B.A. in chemistry from Williams College.