John Hardwig is professor emeritus of philosophy at the University of Tennessee, Knoxville. His research interests include bioethics, especially end-of-life issues, and he is the editor of Is There a Duty to Die?: And Other Essays in Medical Ethics.

Paul D. Simmons is a clinical professor in the Department of Family and Geriatric Medicine and an adjunct professor in the department of philosophy at the University of Louisville. He has written extensively on religion (specifically Baptist) and health care. He is the author of Freedom of Conscience: a Baptist and Humanist Dialogue (2000).

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A scholarly treatment of the debate can be found in the book The Ethics of Embryo Adoption and the Catholic Tradition: Moral Arguments, Economic Reality and Social Analysis, co-edited by Sarah-Vaughan Brakman and Darlene Fozard Weaver.

And a Dec. 31, 2008, Catholic News Service feature looks at one committed Catholic couple who would like to adopt frozen embryos and were perplexed by the Vatican instruction.

Christianity Today, the flagship evangelical monthly, in July 2010 posted a forum on the issue featuring essays exploring different approaches to the question of frozen embryos. “Frozen Embryos: First, Help Couples” is by Ellen Painter Dollar, author of a new book about Christian perspectives on reproductive and genetic technology. “Christians need much better resources for ethical and […]

Kenneth Magnuson is an associate professor of Christian ethics at the Southern Baptist Theological Seminary in Louisville, Ky. He is a member of the Evangelical Theological Society of America and the Center for Bioethics and Human Dignity. He was a participant in the 2006 First Things online symposium on torture.

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Paul J. Litton is associate professor at the University of Missouri School of Law. His specialties include capital punishment, criminal law and morality, and bioethics.