Lisa Heinzerling is a professor of law at the Georgetown University Law Center. She specializes in administrative law, environmental law and food law. She has published several books, including a critique of the use of cost-benefit analysis in environmental policy, and many articles and book chapters. Peer environmental law professors have voted her work among the top 10 articles of the year four times. Heinzerling has been a visiting professor at the Harvard and Yale law schools. From January 2009 to December 2010, Heinzerling served as a political appointee in the U.S. Environmental Protection Agency, first as climate counsel to the EPA administrator and then as associate administrator of EPA’s Office of Policy. Heinzerling was the lead author of the winning briefs in Massachusetts v. EPA, in which the Supreme Court held that the Clean Air Act gives the EPA the authority to regulate greenhouse gases.