Mark T. Mulder is professor of sociology at Calvin University, where he directs the urban studies program and also holds an appointment in the department of congregational and ministry studies. Author of several books, his writing has won awards from the Evangelical Press Association and the Associated Church Press, and his research has been published in journals such as Social Problems and The Journal of Urban History.

Gerardo Martí is the William R. Kenan Jr. Professor of Sociology at Davidson College. He currently serves as president of the Society for the Scientific Study of Religion. Author of several books, his work has been published widely in venues such as Social Forces, Journal for the Scientific Study of Religion, Religion and American Culture, and Sociology of Religion.