Christopher S. Butler taught linguistics at the University of Nottingham for many years and then held a professorial position at what is now York St John University, UK. He retired in 1998. His research interests include theoretical and descriptive aspects of form, meaning and use, within the framework of a functional approach to language, mainly but not exclusively in English and Spanish.
Anne-Marie Simon-Vandenbergen is Professor Emerita at Ghent University, Belgium. Her research interests include functional approaches to grammatical issues in English, with a special focus on modality, and contrastive grammar of English, French and Dutch.