Mark Levin is a venture capital investor at Third Rock Ventures who frequently steps in as founding or interim CEO of the biotech companies he helps create, drawing on his experience as the longtime CEO of Millennium Pharmaceuticals. He has built an unusually extensive LinkedIn network of over 5,000 biotech connections that he uses systematically for relationship building and talent discovery, and co-founded The Possible Project with his wife to teach entrepreneurship to at-risk high school students in Cambridge. Mark Levin is a venture capital investor at Third Rock Ventures who frequently steps in as founding or interim CEO of the biotech companies he helps create, drawing on his experience as the longtime CEO of Millennium Pharmaceuticals. He has built an unusually extensive LinkedIn network of over 5,000 biotech connections that he uses systematically for relationship building and talent discovery, and co-founded The Possible Project with his wife to teach entrepreneurship to at-risk high school students in Cambridge.