Samuel Dash, a professor at Georgetown University Law Center, is a leading lawyer and scholar in constitutional criminal justice and professional responsibility. He was district attorney of Philadelphia, as well as a criminal defense lawyer. He is best known for his work as chief counsel of the U.S. Senate Watergate Committee, which led to the resignation of President Richard Nixon. He has also been active in international human rights matters, in one case helping to mediate the release of Nelson Mandela from prison. He has two grown daughters, Judi-Ellen and Rachel, and lives with his wife, Sara, in Chevy Chase, Maryland.