Donald Ostrowski is a lecturer in history at the Harvard Extension School, where he has taught for over 40 years. His publications include Muscovy and the Mongols: Cross-Cultural Influences on the Steppe Frontier, 1304–1589 (1998); Europe, Byzantium, and the Intellectual Silence of Rus′ Culture (2018); Who Wrote That? Authorship Controversies From Moses to Sholokhov (2020); Russia in the Early Modern World: The Continuity of Change (2022); and, co-authored with Christian Raffensperger, The Ruling Families of Rus: Clan, Family, and Kingdom (2023). His edition of The Povest’ vremennykh let: An Interlinear Collation and Paradosis (2003) received the Early Slavic Studies Association Award for Distinguished Scholarship.