Bettelou Los is a Lecturer in Linguistics at the Vrije Universiteit, Amsterdam. She graduated from the University of Amsterdam in 1986 and has since held teaching and research positions at the University of Amsterdam, the Vrije Universiteit, the University of Nijmegen and other colleges of higher education. She participates in the research program The Diachrony of Complex Predicates in West Germanic, and has published several papers on diachronic syntax. She contributes with Wim van der Wurff to the morphology and syntax section of The Year's Work in English Studies and with Ans van Kemenade is co-editing The Blackwell Handbook of the History of English.