Cass Sunstein is the Robert Walmsley Professor of Law and the Felix Frankfurter Professor of Law at Harvard Law School. Sunstein is an American legal scholar, particularly in the fields of constitutional law, administrative law, environmental law, and law and behavioral economics. He was the Administrator of the White House Office of Information and Regulatory Affairs in the first Obama administration. In the early years of his career, Sunstein clerked for Justice Benjamin Kaplan of the Massachusetts Supreme Judicial Court and Justice Thurgood Marshall of the U.S. Supreme Court, and then worked as an attorney-advisor in the Office of the Legal Counsel of the U.S. Department of Justice. Among many other publications, Sunstein co-authored Nudge: Improving Decisions about Health, Wealth, and Happiness (Yale University Press, 2008) with economist Richard Thaler of the University of Chicago.