Nicholas A. Christakis, MD, PhD, MPH, is the Sterling Professor of Social and Natural Science at Yale University. His work is 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. He was elected to the National Academy of Medicine in 2006; the American Association for the Advancement of Science in 2010; and the American Academy of Arts and Sciences in 2017.