39. RESHMA SHETTY

$750 million  SOURCE: Biotechnology AGE: 41 • RESIDENCE: Boston SELF-MADE SCORE:  She cofounded Ginkgo Bioworks, one of the earliest synthetic biology startups, with a professor and three fellow MIT Ph.D.s including her husband, Barry Canton. Ginkgo’s goal was to create tools to help scientists work faster and easier. In May, it agreed to go public in a $17.5 billion deal with a SPAC founded by former Hollywood exec Harry Sloan; the pact has yet to close.