Visiting Professor at Harvard Law School and McCormick Professor of Jurisprudence and Director of the James Madison Program in American Ideals and Institutions at Princeton University. He is a member of the United States Commission on International Religious Freedom, and previously served on the President's Council on Bioethics and as a presidential appointee to the United States Commission on Civil Rights. He is a former Judicial Fellow at the Supreme Court of the United States, where he received the Justice Tom C. Clark Award. He is a recipient of the United States Presidential Citizens Medal and the Honorific Medal for the Defense of Human Rights of the Republic of Poland.
