Nicholas Christakis is a sociologist and physician known for his research in the areas of social networks and biosocial science. He is the Sterling Professor of Social and Natural Science at Yale University, where he directs the Human Nature Lab. His books include Death Foretold: Prophecy and Prognosis in Medical Care and Connected: The Surprising Power of Our Social Networks and How They Shape Our Lives (coauthored with James H. Fowler). He was on Time magazine’s list of the 100 most influential people in the world in 2009.