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Ian Roberts is Professor of Linguistics at the University of Cambridge. He obtained his PhD at the University of Southern California in 1985. He has held chairs at the University of Wales, Bangor, and at the University of Stuttgart. His books include The Representation of Implicit and Dethematized Subjects (FORIS, 1987), Verbs and Diachronic Syntax (Kluwer, 1993), Comparative Syntax (Edward Arnold, 1996), Syntactic Change (CUP, 2003, with Anna Roussou), and Principles and Parameters in a VSO Language: A Case Study in Welsh (OUP, 2005).