This volume contains an introductory essay, the bibliography of Professor Ringe, and nineteen articles on various aspects of historical linguistics composed by current and former colleagues and students at the University of Pennsylvania and a select number of leading scholars in the field based at institutions such as Cornell University, Harvard University, Oxford University, Saarland University, University of Georgia, University of California at Los Angeles, University of Munich, and York University. The majority of contributions focus upon linguistic phylogenetics (the interrelationships among languages), Classical linguistics, and Germanic linguistics. Many of the contributions make contributions to theoretical, as well as historical, linguistics.