Dag Westerstahl is a Professor of Theoretical Philosophy and Logic at Stockholm University. His interests include logic, formal semantics, and philosophy of language, with a special emphasis on integrating themes such as on generalized quantifiers, studied both from a logical and a linguistic point of view. He has been Secretary General of the International Division of Logic and Methodology of Science, and he is a member of the Royal Society of Arts and Sciences in Gothenburg and of the Royal Swedish Academy of Sciences.