Mark Tushnet is William Nelson Cromwell Professor of Law Emeritus at Harvard Law School. He is the co-author of four casebooks, including the most widely used casebook on constitutional law; has written numerous books, including a two-volume work on the life of Justice Marshall, Advanced Introduction to Comparative Constitutional Law, Taking Back the Constitution: Activist Judges and the Next Age of Constitutional Law, Why the Constitution Matters, and Weak Courts, Strong Rights: Judicial Review and Social Welfare Rights in Comparative Perspective; and has edited several others. He was president of the Association of American Law Schools in 2003. In 2002, he was elected a fellow of the American Academy of Arts and Sciences.