Historical linguistics, Germanic linguistics, history of linguistics, phonology, Scandinavian studies, medieval Germanic studies.
Marc Pierce's published research is mainly in the areas of historical linguistics (especially historical phonology and etymology), phonology, and the history of linguistics. He teaches or has taught a variety of courses in Germanic linguistics and philology (including the history of the German language, Old Saxon, and the structure of the German language), as well as courses in German language and literature, Scandinavian literature, and Great Books.