Cass Sunstein is the Robert Walmsley University Professor at Harvard University, where he is the founder and director of the Program on Behavioral Economics and Public Policy at Harvard Law School. Sunstein is a prolific writer, who has authored over 40 books, and hundreds of articles, including the international bestseller and essential introduction to behavioral science, Nudge: Improving Decisions about Health, Wealth, and Happiness (with Richard H. Thaler, 2008). He is a recipient of the Holberg Prize, the current Chair of the WHO technical advisory group on Behavioural Insights and Sciences for Health, and an advisor to the United Nations, the European Commission, the World Bank, and many nations on issues of law and public policy. He was Administrator of the White House Office of Information and Regulatory Affairs from 2009 to 2012; subsequently, he served on the President's Review Board on Intelligence and Communications Technologies and on the Pentagon's Defense Innovation Board. He is now working on a variety of projects involving the regulatory state, "sludge", fake news, and freedom of speech.