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.

Keith Graber Miller is a professor of Bible and religion at Goshen College in Goshen, Ind. He spoke at a leadership conference for Mennonite pastors titled “Embodying Sexual Wholeness in a Broken World” held at Eastern Mennonite Seminary.

Patricia Beattie Jung is chair and professor of theology at St. Paul School of Theology in Kansas City. She is an expert on Catholic feminism and sexuality.

The Rev. Wellington Boone is a bishop and pastor of the Father’s House and Wellington Boone Ministries in Norcross, Ga.