Directs the nondenominational group “Silver Ring Thing,” based just outside Pittsburgh, Pa. The group uses comedy, drama, music videos and testimonials to promote abstinence in live events each year throughout the country.

Professor of sociomedical sciences at the Mailman School of Public Health at Columbia University in New York.

Director of the Center on Children, Families and the Law and a psychology professor at the University of Nebraska. He reported on research findings that deal with both abstinence-only and comprehensive sex education.

Lawrence Hinman is philosophy professor emeritus and former co-director of the Center for Ethics in Science and Technology at the University of San Diego. His research focuses on emerging ethical issues in science and technology, including the issues raised by stem cell research.

Marilyn Coors is associate professor of bioethics and genetics in the department of psychiatry at the University of Colorado at Denver. She is the author of the book The Matrix: Charting the Ethics of Inheritable Genetic Modification and of “Therapeutic Cloning: From Consequences to Contradiction” in the June 2002 edition of The Journal of Medicine and Philosophy.

Rebecca Rae Anderson is the vice chair of health promotion, social and behavioral health sciences at the University of Nebraska Medical Center in Omaha.  She is a board-certified genetic counselor, a member of the Social, Ethical, Legal Issues Committee of the American College of Medical Genetics and the author of Religious Traditions and Prenatal Genetic Counseling.

Glenn Graber is a philosophy professor at the University of Tennessee in Knoxville. His writings include “The Moral Status of Gametes and Embryos: Storage and Surrogacy” in Health Care Ethics: Critical Issues for the 21st Century (2nd Edition).

Kenneth A. Richman is associate professor of philosophy and health care ethics at the Massachusetts College of Pharmacy and Health Sciences in Boston. He is author of Ethics and the Metaphysics of Medicine: Reflections on Health and Beneficence. He can be contacted through his website.

Darlene Fozard Weaver is an associate professor of theology at Duquesne University in Pittsburgh Pa. She is head of the school’s new Center for the Catholic Intellectual Tradition. Weaver co-edited The Ethics of Embryo Adoption and the Catholic Tradition: Moral Arguments, Economic Reality and Social Analysis (2008).