Nicholas A. Christakis is a sociologist and physician known for his research on social networks and on the socioeconomic and biosocial determinants of behavior, health, and longevity. He is the Sol Goldman Family Professor of Social and Natural Science at Yale University, directs the Human Nature Lab, and co-directs the Yale Institute for Network Science. From 2001-2013, he taught multiple subjects (including medicine and sociology) at Harvard. Christakis has been named to Time magazine’s list of the 100 most influential people in the world and to Foreign Policy magazine’s list of top global thinkers. He was elected to the Institute of Medicine of the National Academy of Sciences in 2006 and named a Fellow at the American Association for the Advancement of Science in 2010. Christakis was educated at Yale, Harvard, and the University of Pennsylvania.