Physician and sociologist Nicholas A. Christakis is the Sterling Professor of Social and Natural Science at Yale University. He works in the fields of network science, biosocial science, and behavior genetics. He directs the Human Nature Lab and is the Co-Director of the Yale Institute for Network Science. Dr. Christakis has been elected to the National Academy of Medicine, the American Association for the Advancement of Science, and the American Academy of Arts and Sciences. He is the author of more than 200 articles and several books, including Blueprint: Evolutionary Origins of a Good Society. In 2009, TIME Magazine named him one of the 100 most influential people in the world.