Alexander Adelaar is Associate Professor and Reader in Indonesian at the University of Melbourne, Australia. His main publications are on Austronesian historical and descriptive linguistics, especially Malay varieties, Malagasy, languages of West Borneo and Siraya (Taiwan).Nikolaus P. Himmelmann was previously Professor and Chair at the Westfalische Wilhelms-Universitat, Germany. He has done fieldwork in the Philippines (Tagalog), Sulawesi (Tomini-Tolitoli languages) and East Timor (Waima'a) and published widely on a number of core issues in Austronesian grammar, including the nature of lexical and syntactic categories and voice.