Heather Ann Clements is a professor of systematic theology at Azusa Pacific University in Azusa, Calif. She has written about an Anabaptist and Mennonite environmental ethic.

Susan P. Bratton is a professor in the environmental studies department at Baylor University in Waco, Texas, with an expertise in the interface between religion and environmental ethics. She is the author of Environmental Values in Christian Art (2007).

Thomas Anthony Shannon is professor of religion and ethics at the Worcester Polytechnic Institute in Worcester, Mass. He wrote Made in Whose Image?: Genetic Engineering and Christian Ethics (Humanity Books, 2000) and co-wrote New Genetic Medicine: Theological and Ethical Reflections (Rowman & Littlefield, 2003).

The Rev. John Langan is a professor of philosophy at Georgetown University in Washington, D.C. He wrote the entry “Stem Cell Research and Religious Freedom” for Stem Cell Research: New Frontiers in Science and Ethics.

John Hyde Evans is a sociologist at the University of California, San Diego. He wrote Playing God?: Human Genetic Engineering and the Rationalization of Public Bioethical Debate and The History and Future of Bioethics: A Sociological View.

Michael M. Mendiola was associate professor of Christian ethics for the Graduate Theological Union in Berkeley, Calif. He wrote the article “Human Embryonic Stem Cells: Possible Approaches from a Catholic Perspective” for The Human Embryonic Stem Cell Debate (MIT Press, 2001). Mendiola passed away in 2008.

Loren Swartzendruber is president of Eastern Mennonite University in Harrisonburg, Va.

Steven Tracy is a professor of theology and ethics at Phoenix Seminary in Phoenix, Ariz. Gender and sexuality issues are among his specialties. He and his wife are the founders of Mending the Soul Ministries, which focuses on Christian married couples.

Douglas Mohrmann is an associate professor of religion at Cornerstone University in Grand Rapids, Mich. He contributed a chapter titled “Is Anyone Listening? The Waning Voice of the Bible in Sexual Ethics” to the book Religion and Sexuality: Passionate Debates.