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.

The Rev. Billy Wilson runs World Impact, an evangelism television ministry based in Cleveland, Tenn.

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).

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. […]

Rodney Harrison is vice president for institutional effectiveness, dean of online education, director of doctoral studies and associate professor of Christian education at Midwestern Baptist Theological Seminary in Kansas City, Mo. He is a veteran church planter, having started churches in Minnesota, California and the Dakotas.

Gary Rohrmayer, president and executive minister of Converge MidAmerica, overseeing its business and ministry interests that supports regional church planting and ongoing care of its partner churches.

Daniel V. A. Olson, associate professor of sociology at Purdue Univeristy. Specializes in sociology of religion and has written about church growth.