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.

Daniel Montgomery founded and serves as the lead pastor for Sojourn Community Church in Louisville, Ky., a church plant. Sojourn began as an attempt to reach people who were falling through the cracks in more mainstream churches. It officially launched in September 2000 using rented space and has expanded to include multiple campuses.

The American Religion Data Archive lists Pentecostal denominations (scroll down to U.S. Denominations). Some scholars have named more than 300.

See a timeline of the Azusa Street revival.