Bridget Heal is director of the Reformation Studies Institute at the University of St Andrews. She is the author of The Cult of the Virgin Mary in Early Modern Germany: Protestant and Catholic Piety, 1500 1648 (Cambridge University Press, 2007), and of A Magnificent Faith: Art and Identity in Lutheran Germany (Oxford University Press, forthcoming). She has published extensively on various aspects of Lutheran visual culture during the early modern period, and currently co-edits the journal German History . Joseph Leo Koerner is the Thomas Professor of History of Art and Architecture and a Senior Fellow of the Society of Fellows, Harvard University. He was co-curator of the 2002 exhibition Iconoclash: Beyond the Image Wars (ZKM, Karlsruhe). His books include The Reformation of the Image (University of Chicago Press, 2004) and Bosch and Bruegel: From Enemy Painting to Everyday Life (Princeton University Press, 2016).