Yoichi ISAHAYA is a Specially Appointed Associate Professor for the Platform for Explorations in Survival Strategies at the Slavic-Eurasian Research Center, Hokkaido University. His research focuses on the history of premodern Eurasia, the history of science, and the Mongol empire. He earned his Ph.D. in Area Studies from the Graduate School of Arts and Sciences, the University of Tokyo, in September 2015, with a dissertation titled Dialogue Concerning Two Astral Sciences: Naṣīr al-Dīn al-Ṭūsī, a Sage of Cathay, and Their Chinese Calendar in the Zīj-i Īlkhānī (c. 1272 AD).

His research examines the Mongol empire (1206–1368) within an Afro-Eurasian framework, emphasizing cross-cultural interactions and environmental history. During his doctoral studies, he studied at the Institute for the History of Science, University of Tehran. After completing his doctorate, he served as a postdoctoral fellow with the ERC project “Mobility, Empire, and Cross-Cultural Contacts in Mongol Eurasia” at the Hebrew University of Jerusalem, as a JSPS Research Fellow at Rikkyo University, and later as an Assistant Professor at the Slavic-Eurasian Research Center, Hokkaido University.

His recent Japanese monograph, The Mongol Empire in the History of Eurasia (Misuzu Shobô, 2025), situates the Mongol empire within the broader dynamics of Eurasian history. He currently leads the JSPS Grant-in-Aid for Scientific Research (A) project “Climate Change, Plagues, and Wars: The ‘Crisis of the Fourteenth Century’ in the Afro-Eurasian Context” (FY2025–2029).

He also serves as General Editor of Acta Slavica Iaponica and as International Correspondent for Annales. Histoire, Sciences Sociales.