Grant Wacker is professor emeritus of Christian history at Duke University Divinity School in Durham, N.C. He specializes in the history of evangelicalism, Pentecostalism and world missions and is the author of Heaven Below: Early Pentecostals and American Culture.

Wesley Granberg-Michaelson is general secretary of the Reformed Church in America, with headquarters in Grand Rapids, Mich. In October 2005 he gave an address in New York City on the promise of Pentecostal Christianity and the need for mainline churches like his own to forge bonds with this burgeoning, global movement.

Edith L. Blumhofer is director of the Institute for the Study of American Evangelicals at Wheaton College in Wheaton, Ill. She has written extensively on Pentecostalism.

Allan H. Anderson is professor of  global Pentecostal studies at the Centre for Pentecostal and Charismatic Studies at the University of Birmingham in the United Kingdom.

David Daniels, a professor at McCormick Theological Seminary in Chicago, is an expert in African Pentecostalism.

Cecil M. “Mel” Robeck Jr. is a professor of church history and ecumenics and director of the David J. DuPlessis Center for Christian Spirituality at Fuller Theological Seminary in Pasadena, Calif. Robeck is a leading scholar and commentator on Pentecostalism and author of The Azusa Street Mission and Revival, (Thomas Nelson Publishers, 2006).

Arlene Sánchez-Walsh is a religious studies professor at Azusa Pacific University in Azuza, California. She is an authority on Latino evangelicals, and her current research is on the rise of nonbelief among Latinos and Latinas. Her books include Latino Pentecostal Identity: Evangelical Faith, Self and Society.  

Robin D. Perrin, professor of sociology at Pepperdine University in Malibu, Calif. Specializes in sociology of religion. Has written numerous articles on religion including “Examining the Sources of Conservative Church Growth: Where are the New Evangelical Movements Getting Their Numbers?” for the Journal for the Scientific Study of Religion in 1997.

Bob Hyatt is a pastor and elder at the Evergreen Community (Motto: “Life’s short, why not apply for an extension?”), a church plant that was founded in 2004 and which meets in a pub in Portland, Ore. Evergreen believes it is important to give the “unchurched” and the “formerly churched” a place to belong before they believe. […]