Francesca Dell'Acqua is Marie Curie Fellow at the Centre for Byzantine, Ottoman, and Modern Greek Studies, University of Birmingham (2015-17), where she investigates the Western response to the Byzantine iconoclasm. She is interested in the materiality of objects and their contribution to cultural history and traditions in the Medieval West and the Mediterranean area. Anthony Cutler is the Evan Pugh Professor of Art History at Penn State University. He is an international expert on ivory carving with numerous works. Herbert L. Kessler is Professor Emeritus of Johns Hopkins University (Baltimore). He is currently an Invited Professor at the Masaryk University in Brno; a Fellow of the Medieval Academy of America and the American Academy of Arts and Sciences, he is the author or editor of some 20 books and nearly 200 articles and reviews.Avinoam Shalem is the Riggio Professor of the arts of Islam at the Columbia University. His main field of interest is in medieval artistic interactions in the Mediterranean, medieval aesthetics and the historiography of the field. Gerhard Wolf is Director of the Kunsthistorisches Institut / Max-Planck-Institut in Florence (since 2003) and honorary professor at the Humboldt-Universität zu Berlin (since 2008). His main research fields and projects include Mediterranean art histories and pre-modern globalization, theories of the image, as well as sacred topographies in an interreligious perspective.