William Croft is Professor of Linguistics at the University of Manchester. His books include Studies in Typology and Diachrony for Joseph H. Greenberg (edited with Keith Denning and Suzanne Kemmer, 1990), Typology and Universals (Cambridge, 1990), Syntactic Categories and Grammatical Relations: the Cognitive Organization of Information (1991), Explaining Language Change: An Evolutionary Approach (2000), and Radical Construction Grammar: Syntactic Theory in Typological Perspective (2001).