Brian D. Joseph is an American linguist specializing in historical linguistics. He is a Distinguished University Professor of Linguistics and the Kenneth E. Naylor Professor of South Slavic Linguistics at Ohio State University. His research interests include language change, Greek, Albanian, and general Balkan linguistics, and morphological theory. He was elected a Member of the American Philosophical Society in 2019.
Joseph received an A.B. in linguistics from Yale University, and his A.M. and Ph.D. in linguistics from Harvard University. After a year at the University of Alberta as an Izaak Walton Killam Memorial Post-doctoral Fellow, he moved to Ohio State University, where he has spent his entire professional career, retiring in June 2024 and becoming Professor Emeritus.
Joseph was the Vice-President of the Linguistic Society of America in 2018 and served as the organization's President in 2019. He was previously President of the North American Association for the History of the Language Sciences and currently serves as co-editor of the Journal of Greek Linguistics, a journal he helped to found in 2000.