Christopher Bader is a professor of sociology at Chapman University. He serves as associate director of the Association of Religion Data Archives and was principal investigator of the first two waves of the Baylor Religion Survey.

William Lindsey is an assistant professor of religious studies at the University of Kansas in Lawrence. While a professor at Philander Smith College in Little Rock, Ark., he co-edited Religion and Public Life in the Southern Crossroads: Showdown States.

Darby Kathleen Ray is an associate professor of religious studies and director of the Millsaps Faith and Work Initiative at Millsaps College in Jackson, Miss. She is the editor of Theology That Matters: Ecology, Economy and God (2006).

Kevin J. Christiano is an associate professor of sociology who specializes in religion at the University of Notre Dame in South Bend, Ind. He is the author of Sociology of Religion: Contemporary Developments and has written and taught extensively on the sociology of religion.

Walter Sundberg teaches church history at Luther Seminary in St. Paul, Minn., and has written about religion, politics and trends in American religion.

Dale Soden is a history professor at Whitworth University in Spokane, Wash. He contributed a chapter on mainline Protestants, Catholics and Jews in the Pacific Northwest to Religion and Public Life in the Pacific Northwest: The None Zone.

Mark Shibley is a sociologist at Southern Oregon University in Ashland, Ore. He has studied spirituality in the Pacific Northwest, historically the region with the greatest number of religiously unaffiliated people in the United States, and contributed a chapter on the subject to Religion and Public Life in the Pacific Northwest: The None Zone.

Bill McKinney was president of the Pacific School of Religion at the Graduate Theological Union in Berkeley, Calif. for fourteen years before he retired in 2010. He is an ordained minister in the United Church of Christ and a religion sociologist who is an expert on American Protestantism.

Patricia O’Connell Killen teaches American religious history at Pacific Lutheran University in Tacoma, Wash. She is the co-editor of Religion and Public Life in the Pacific Northwest: The None Zone. She is an expert on people in that region who claim no religious affiliation.