Professor Milton J. Coalter is the librarian at the Union Theological Seminary and Presbyterian School of Christian Education in Richmond, Va. Also an ordained minister in the Presbyterian Church. He has written on the decline and growth prospects of mainstream Protestantism.

Judith R. Blau, professor of sociology at the University of North Carolina, Chapel Hill, has written about the expansion of religion and church membership in the U.S.

Manuel Ortiz, professor emeritus professor of ministry and urban mission at Westminster Theological Seminary in Glenside, Pa. Has focused his work on multicultural churches and the religious lives of American Hispanics.

Charles Ridley is professor of counseling psychology at Texas A & M University. Previously, he has taught at Indiana University and the Graduate School of Psychology at Fuller Theological Seminary. He is also licensed psychologist and Fellow of the American Psychological Association.

Professor of Hebrew Bible at the Hartford Seminary’s Center for Faith in Practice. He can discuss movements and trends in Korean-American Christian churches.

Hugh De Pree Professor of Leadership Development at Fuller Theological Seminary in California. Ordained minister in the Presbyterian Church (USA). Formerly served as George Butler Associate Professor of Church Administration and Finance as well as assistant dean for institutional research at Claremont School of Theology. Can discuss church growth.

Donald E. Miller is a professor of religion and sociology at the University of Southern California and executive director of the school’s Center for Religion and Civic Culture. His books include Reinventing American Protestantism: Christianity in the New Millennium, for which he looked at “new paradigm” churches, in particular three megachurches that began in Southern California.

Author and researcher C. Kirk Hadaway is director of research for the Episcopal Church Center. He has written widely on the subject of church growth and also worked with the United Church of Christ and Southern Baptist denominations.

Mark David Hall is a professor of political science at George Fox University in Newberg, Ore. Publications include The Forgotten Founders on Religion and Public Life (2009); and The Sacred Rights of Conscience: Selected Readings on Religious Liberty and Church-State Relations in the American Founding (2009).