Patricia O’Connell Killen teaches American religious history at Pacific Lutheran University in Tacoma, Wash. She is the co-editor of Religion and Public Life in the Pacific Northwest: The None Zone. She is an expert on people in that region who claim no religious affiliation.

ChurchFitness.com helps churches establish and build fitness ministries. It provides equipment and training programs.

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.

John L. Jackson Jr. is the Richard Perry University Professor of Communication, Africana Studies and Anthropology in the Standing Faculty of the Annenberg School for Communication and the Standing Faculty of the School of Arts and Sciences at the University of Pennsylvania. He has researched the beliefs and practices of Black Hebrews.

The Carter Center in Atlanta is involved in human rights worldwide. Read the center’s May 14, 2004, publication “Human Rights Defenders on the Frontlines of Freedom: Protecting Human Rights in the Context of the War on Terror.”

Ferenc Szasz is an associate professor of history at the University of New Mexico and author of Religion in the Modern American West.

Daniel Heimbach is Professor of Christian Ethics at Southeastern Baptist Theological Seminary in Wake Forest, N.C. He was a participant in the 2006 First Things online symposium on torture.

Read a Sept. 17, 2005, New York Times article about the spread of Christian and Jewish yoga.

Read an October 1989 letter to the bishops of the Catholic Church on the subject of Christian meditation written by then-Cardinal Joseph Ratzinger, now Pope Benedict XVI. In it, Ratzinger addresses yoga.