Career
Professor, of Greek and Byzantine History, Brussels University. Sather Professor University of California 1938. Company-Founder Ecole Libre des Hautes Etudes New New York
Vice-Dean Faculty of Letters 1941-1945, President 1944.
Assistant Professor, of History, New School for Social Research, New New York President Association Institute des Byzantinistes.
Founder and Jt. President Centre National de Recherches Byzantines, and
Chairman Academy, of Mythological and Religious Research, Bulgarian Historical Society. Byzantine Instituts of Providence, Rhode Island, Paris and Istanbul, et cetera
Honorary degree (Paris, Athens, Thessalonika, Algiers, Sofia, Cairo).