Robert Stevens is master of Pembroke College, Oxford, and serves as counsel to the law firm Covington & Burling, where his practice involves international commercial law and competition law. He has also taught at Yale and Tulane Universities, and has authored many articles and books, including studies of social legislation and the legal profession in the United States and the United Kingdom. Rosemary Stevens is professor of history and sociology of science at the University of Pennsyvlania. Educated at Oxford, Yale, and Manchester, she has also taught at Yale University and Tulane University. She is the author of American Medicine and the Public Interest and In Sickness and in Wealth: American Hospitals in the Twentieth Century.