Zellerbach Family Professor of Psychology & Director of the Positive Psychology Center at the University of Pennsylvania
Founder and CEO of reCAPTCHA and Duolingo
Chief Economist of Moody's Analytics; Co-Founder of Economy.com
Infectious Disease Expert; Former Director of the U.S. Centers for Disease Control & Prevention (CDC)
Listen First, Treat Later: Dr. Julie Gerberding on the HIV Epidemic ...