Career
Professor, of Greek and Byzantine History, Brussels University. Sather Professor University of California 1938. Co-Founder Ecole Libre des Hautes Etudes New York.
Vice-Dean Faculty of Letters 1941-1945, President 1944. Assistant Professor, of History, New School for Social Research, 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, R.I., Paris and Istanbul, etc.
Honorary degree (Paris, Athens, Thessalonika, Algiers, Sofia, Cairo).