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Ülo Valk is Professor of Estonian and Comparative Folklore at the University of Tartu, Estonia. He is the editor of Numen: International Review for the History of Religions. His publications include The Black Gentleman: Manifestations of the Devil in Estonian Folk Religion and Storied and Supernatural Places: Studies in Spatial and Social Dimensions of Folklore and Sagas (co-edited with Daniel Sävborg).

Marion Bowman is professor of Vernacular Religion at Open University, UK. She has published and researched extensively on vernacular religion, contemporary spirituality, non-traditional pilgrimage, material religion and the town of Glastonbury.