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.

Sister Donna Marie Beck is professor emerita and former director of music therapy at the Mary Pappert School of Music at Duquesne University in Pittsburgh, Pa. She is also a Catholic nun and the facilitator of a healing community drum circle.

Marc Anderson has a DVD/CD titled Drums in the Church: A Practical Guide for Percussion in Christian Worship. He teaches workshops and classes and is based in Minneapolis-St. Paul.

Bruce Adolph is the publisher of Christian Musician Magazine and Worship Musician! Magazine and produces the Christian Musician Summit conferences. He can discuss the role of drums in contemporary Christian worship. He is based in Puyallup, Washington.

100 Influential Voices from the Arab World is a project by The Center for Global Engagement at the Institute for American Values and Al-Tasamoh developed this list of scholars, thinkers, journalists and artists that influence the Arab world.

Mona Eltahawy is a speaker, writer and commentator who focuses on issues concerning Islam. She is based in New York City.

Paul Barrett was a reporter for The Wall Street Journal and author of American Islam: The Struggle for the Soul of a Religion (2006). He currently directs the investigative reporting unit at BusinessWeek. Contact via Farrar, Straus and Giroux Publicity.