Leena Kahlas-Tarkka is Docent, University Lecturer Emerita of English Philology at the University of Helsinki. Her research interests cover various aspects of diachronic study of English, particularly Old and Middle English syntax. She was a member of the project compiling The Helsinki Corpus of English Texts, and has been an active member of the Research Unit for the Study of Variation, Contacts and Change in English (VARIENG) since its beginnings.