Gerhard Lutz Author & Editor

Gerhard Lutz, PhD is the Robert P. Bergman Curator of Medieval Art, Cleveland Museum of Art. Elina Gertsman is professor of Art History and director of Graduate Studies, Case Western. Stefan Roller is head of department of Medieval Sculpture, Liebieghaus Skulpturensammlung. Sophie Jugie is directrice du departement des sculptures, Musee du Louvre Pierre-Yves Le Pogam is conservateur en chef au departement des sculptures, Musee du Louvre. Lise Leroux is research engineer, geologist, laboratoire de recherche des monuments historiques Ministere de la culture, Paris. Wolfram Kloppmann is isotope geochemist BRGM-Bureau de Recherches Geologiques et Minieres, Orleans.