Gregorios Stathis is professor emeritus of Byzantine musicology and hymnology at the National and Kapodistrian University of Athens and a preeminent, internationally recognized scholar in the field. He has studied the vast repository of medieval and late Greek music manuscripts containing Byzantine chant notations the world over, including Mount Sinai and Mount Athos. The author of many publications and choirmaster of numerous recordings of Byzantine and post-Byzantine chant, he is most recognized for his award-winning catalogue of the chant manuscripts on Mount Athos, now in its fifth volume, as well as his descriptive catalogue of the chant manuscripts in the monasteries of Meteora.
Konstantinos Terzopoulos, one of the author's doctoral students, is a parish priest, an independent scholar and researcher in Byzantine musicology and Orthodox theology and liturgy. He is the author of works on Byzantine chant, Byzantine liturgy and Typikon. He is currently preparing a critical edition and English translation of the homilies of Anastasius Sinaita.