Rudolf Botha is Professor of General Linguistics at the University of Stellenbosch, and a Fellow of the Netherlands Institute for Advanced Study. His books include Form and Meaning in Word Formation: A Study of Afrikaans Reduplication (CUP 1988), Unravelling the Evolution of Language (Elsevier 2003) and, co-edited with C. Knight, The Cradle of Language and The Prehistory of Language (both OUP 2009).
Martin Everaert is Professor of Linguistics and Director of the Institute of Linguistics at the University of Utrecht. His research interests include syntactic theory and the lexicon-syntax interface and his books The Syntax of Reflexivization, (Dordrecht: Foris 1986) and, as co-editor, The Unaccusativity Puzzle (OUP 2004), The Blackwell Companion to Syntax (2007), and The Theta Sytsem (OUP 2012).