Don Ringe is Professor of Linguistics at the University of Pennsylvania. He was educated at the Universities of Kentucky, Oxford, and Yale and has taught classical studies and linguistics at university level since 1983. His numerous publications on comparative Indo-European linguistics, historical linguistics, and computational cladistics include On the Chronology of Sound Changes in Tocharian (American Oriental Society 1996) and Historical Linguistics: Towards a Twenty-First Century Reintegration (with Joseph F. Eska; CUP 2013).