Jay Jasanoff is the Diebold Professor of Indo-European Linguistics and Philology at Harvard University. He specializes in historical linguistics, focusing particularly on the Indo-European language family. Jasanoff's work encompasses various branches of Indo-European languages, including Indo-Iranian, Anatolian, Hittite, Greek, Italic, Celtic, Tocharian, Germanic, Baltic, Slavic, Armenian, and Albanian. His research interests are centered on general historical linguistics and the individual nuances of these languages within the broader framework of Indo-European studies. He has amassed significant publications in the field, contributing to the understanding of the historical development and relationships of these languages.