MATTHEW O. JACKSON is the William D. Eberle Professor of Economics at Stanford University, an external faculty member of the Santa Fe Institute, and a senior fellow of the Canadian Institute for Advanced Research. He has been researching social and economic networks for more than twenty-five years and has published Social and Economic Networks, a leading graduate-level text on the subject. Jackson is a member of the National Academy of Sciences; a fellow of the American Academy of Arts and Sciences, the Econometric Society, and the Game Theory Society; an Economic Theory Fellow; and former Guggenheim Fellow. He has reached more than a million students via his popular online courses on social and economic networks and game theory.