Cass R. Sunstein is an American legal scholar, particularly in the fields of constitutional law, administrative law, environmental law, and law and behavioral economics, who currently is the Administrator of the White House Office of Information and Regulatory Affairs in the Obama administration. For 27 years, Sunstein taught at the University of Chicago Law School, where he continues to teach as the Harry Kalven Visiting Professor. Sunstein is currently Professor of Law at Harvard Law School, where he is on leave while working in the Obama administration.