Rebecca Sager is an assistant professor of sociology at Loyola Marymount University in Los Angeles. She wrote Faith, Politics, and Power: The Politics of Faith-Based Initiatives (Oxford, 2010).

John DiIulio Jr. is a professor of politics, religion and civil society at the University of Pennsylvania and was the first director of the White House Office of Faith-Based and Community Initiatives. A frequent speaker and writer on faith-based social services, he is co-editor of What’s God Got to Do With the American Experiment? (Brookings, 2000).

Phillip Johnson is a retired professor of law at the University of California, Berkeley. After converting to Christianity, Johnson wrote two books on evolution and naturalistic philosophy for the general reader, one of which is Darwin on Trial, which is largely credited as founding the idea of intelligent design.

Patricia Telesco is the co-author of Sacred Beat: From the Heart of the Drum Circle. She has been participating in drum circles for many years and lives in Amhearst, N.Y. Contact via Bonni Hamilton, director of publicity for Red Wheel/Weiser.

Rabbi Rayzel Raphael leads drum circles in Philadelphia.

Adair T. Lummis is a religion sociologist and a faculty associate in research at Hartford Seminary in Hartford, Conn. Her research focuses on denominational policies; gender, spirituality and leadership in communities of faith; and clergy concerns. Her books include, as co-author, Clergy Women: An Uphill Calling.

Jan Gregory was an adjunct professor of liturgy, worship and spirituality at Hartford Seminary in Hartford, Conn., where she taught a course in drumming and worship.

Drummers for Jesus is an international Christian ministry that spreads the gospel through drums. The ministry is based in Rockwall, Texas, and has a list of chapters throughout the U.S.

Terl Bryant is a drummer and author of A Heart to Drum, published in 2006. He lives in Great Britain.