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Christian is a professor at CNRS, Paris. His research interests are: history and civilization of ancient Arabia and the first century of Islam; history and civilization of ancient Ethiopia; archaeology (Yemen, Ethiopia); South Arabian epigraphy; history.
Joseph is a professor in the Institute of Archaeology at The Hebrew University of Jerusalem. His research interests are: Nabatean art and archaeology; archaeology of Israel and of the Middle East in the Hellenistic, Roman and Byzantine periods.
Michael is a professor in the Department of Arabic Language and Literature at The Hebrew University of Jerusalem. His research interests are the social and political history of early Islam, with a particular emphasis on prospography, and on the biography of Muhammad.