Peter Ackema is lecturer in Dutch Linguistics at the University of Nijmegen. He has worked extensively on issues regarding the morphology-syntax interface, on which he has published a book (Issues in Morphosyntax, 1999) as well as numerous articles. he has also published on a wide range of syntax-internal and morphology-internal topics, in such journals as Linguistic Inquiry, Natural Language and Linguistic Theory and Yearbook of Morphology. Ad Neeleman is Reader in Linguistics at University College London. His main research interests are case theory, the syntactic encoding of thematic dependencies, and the interaction between the syntax and syntax-external systems. Earlier works include Complex Predicates (1993), Flexible Syntax (1999, with Fred Weerman), and a number of articles in such journals as Linguistic Inquiry, Natural Language and Linguistic Theory and Yearbook of Morphology.