Johannes C. Eichstaedt is Marty Seligman’s PhD student at the University of Pennsylvania, where he founded the World Well-Being Project in 2011. He was elected an Emerging Leader in Science & Society by the American Association for Advancement of Science. Johannes received a B.S. in Physics & Philosophy from King’s College, London, a M.S. in Particle Physics from the University of Chicago, a Master of Applied Positive Psychology from the University of Pennsylvania, and is now in clinical psychology training in addition to his PhD research. As a computational psychologist, Johannes works on ways to measure the psychological states of large populations in space and time using social media, text mining and serious computing, to visualize them in clever new ways borrowed from Physics, and to use them to understand and predict health outcomes like heart disease and societal ills like crime.