Dr. Andreas Lehnertz is a postdoctoral research fellow at the Martin Buber Society at the Hebrew University of Jerusalem. Prior to that, he was a postdoctoral research fellow in the Beyond the Elite project. He is a social historian who studies Christian-Jewish relations, Jewish craftspeople, Jewish and Christians sealing practices, as well as Jewish oath-taking, in medieval Ashkenaz. Dr. Lehnertz’s PhD, entitled Judensiegel im spätmittelalterlichen Reichsgebiet. Beglaubigungstätigkeit und Selbstrepräsentation von Jüdinnen und Juden (Jewish Seals in the Late Medieval Holy Roman Empire: Sealing Practices and Self-Representation of Jewish Men and Women), was published by Harrassowitz in 2020. He is currently writing his second book about Jewish craftspeople in medieval Ashkenaz.