HEATHER SUSAN BURNETTI am a CNRS researcher working in the Laboratoire de Linguistique Formelle at the Université de Paris 7-Denis Diderot. My work involves describing new patterns of structure, meaning and communication in natural languages, and then developing new mathematical tools for analyzing them. Much of my research has focused on classic topics in natural language semantics, such as quantification, vagueness, gradability and negation; however, my more recent work studies properties of social meaning and sociolinguistic variation with a view to constructing an empirically well-founded, mathematically explicit and computationally implemented theory of identity construction through language. So far, my work in this area has been centred around the linguistic construction of regional, gender and sexual identity in France and Canada. Although the tools and frameworks that I develop aim to capture aspects of the full range of human languages, my theoretical ideas are often first informed by my own dialectological and sociolinguistic fieldwork studies of languages of the Gallo-Romance family: varieties of French spoken in Canada and in France, historical varieties of French (particularly Old and Middle French), and endangered Gallo-Romance languages, both Oïl varieties (esp. Picard and Normand) and Occitan varieties (esp. Languedocien and Limousin).