Lourens de Vries (1955) studied linguistics at the Free University of Amsterdam. He completed his Ph.D. in 1989 with the dissertation Studies in Wambon and Kombai: Aspects of two Papuan Languages of Irian Jaya. Robinia de Vries-Wiersma (1957) is co-author of the present book and responsible for the phonological introduction preceding the morphology. The authors are members of the Mission of Reformed Churches. Lourens de Vries is currently engaged in further Linguistic research in southern Irian Jaya.