Christian Gastgeber studied classics and Byzantine studies at the University of Vienna. After receiving his doctorate in 2002, he joined the staff of the Byzantine Section of the Austrian Academy of Sciences, Vienna, specialising in Greek palaeography and diplomatics. He is editor-in-chief of Biblos, a periodical for the history of books, libraries, script, and typography issued by the Austrian National Library in Vienna. Stephan Fussel is director of the Institute of the History of the Book at the Johannes Gutenberg University of Mainz, and holder of the Gutenberg Chair at the same university.