Ruth R. Faden, Ph.D., M.P.H., is the Philip Franklin Wagley Professor of Biomedical Ethics and Director of the Bioethics Institute at Johns Hopkins University. From 1994-1995, she was appointed by President Clinton to chair the Advisory Committee on Human Radiation Experiments. Dr. Faden has published extensively in ethics and health policy, research ethics, and health behavior. Nancy E. Kass, Sc.D., is Assistant Professor in the Program in Law, Ethics, and Health of the Johns Hopkins School of Public Health. Dr. Kass has conducted research and authored numerous publications in bioethics...