André Droogers is professor emeritus of cultural anthropology at the Vrije Universiteit, Amsterdam. Peter B. Clarke is professor emeritus of the history and sociology of religion at King’s College, University of London. Grace Davie is chair of the Sociology of Religion Department at the University of Exeter. Sidney M. Greenfield is professor emeritus at the University of Wisconsin-Milwaukee. Peter Versteeg is a post-doctoral research fellow at the Vrije Universiteit.