Alexandra Y. Aikhenvald is Distinguished Professor, Australian Laureate Fellow, and Director of the Language and Culture Research Centre at James Cook University. She is a major authority on languages of the Arawak family, from northern Amazonia, and has written grammars of Bare (1995) and Warekena (1998), plus A Grammar of Tariana, from Northwest Amazonia (Cambridge University Press, 2003), in addition to essays on various typological and areal features of South American languages. Her other major publications, with OUP, include Classifiers: A Typology of Noun Categorization Devices (2000), Language Contact in Amazonia(2002), Evidentiality (2004), The Manambu Language of East Sepik, Papua New Guinea, (2008), Imperatives and Commands (2010), Languages of the Amazon (2012), and The Art of Grammar (forthcoming). R. M. W. Dixon is Adjunct Professor and Deputy Director of the Language and Culture Research Centre at James Cook University. He has published grammars of a number of Australian languages (including Dyirbal and Yidiñ), in addition to A Grammar of Boumaa Fijian (University of Chicago Press, 1988), The Jarawara Language of Southern Amazonia (Oxford University Press, 2004;, paperback 2011) and A Semantic Approach to English Grammar (Oxford University Press, 2005). He is also the author of the three volume work Basic Linguistic Theory (Oxford University Press, 2010-12) and of an academic autobiography I am a linguist (Brill, 2011).