Cass R. Sunstein is the Administrator of the Office of Information and Regulatory Affairs in the Obama Administration and the Felix Frankfurter Professor of Law at Harvard University. He is the author of many books, including the New York Times best-seller Nudge (with Richard Thaler), Infotopia, Republic 2.0, Worst-Case Scenarios, Radicals in Robes, Why Societies Need Dissent, and Democracy and the Problem of Free Speech.