Holger Klein is Professor of Early Christian, Byzantine, and Western Medieval Art and Archaeology at Columbia University, New York.

His research focuses on Late Antique, Early Medieval, and Byzantine art and architecture, more specifically, on the cult of relics, reliquaries, and issues of cultural and artistic exchange.

He is a Visiting Fellow at CAS from June to July 2015 and May to June 2016 upon invitation from Prof. Dr. Franz Alto Bauer.