Donald A. Luidens, professor of sociology at Hope College in Holland, Mich. (affiliated with the Reformed Church in America), has followed the evolution of denominations and denominationalism in the U.S.

Darren E. Sherkat is a professor of sociology at Southern Illinois University at Carbondale. He studies the intersection of religion, family and politics, and he’s working on a book about marijuana legalization.

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

The Encyclopedia of Religion and Society entry on Pentecostalism gives an overview of the history and issues facing Pentecostalism.

Read an April 15, 2006, article from the Washington Post about the Azusa Street centennial celebration.

Read an Aug. 25, 2002, Baltimore Sun article republished by Religion News Blog describing the growth of black megachurches and neo-Pentecostalism.

Read an April 11, 2013, article from The Christian Post about controversy surrounding the outgoing president of the largest Pentecostal academic society.

Read an April 7, 2013, article from the Milwaukee Journal Sentinel about the growth of Pentecostalism.

Read a Jan. 1, 2006, Washington Times story, “Pentecostalists to mark centennial.”