Paul Wenzel Geissler teaches social anthropology at the Institute of Social Anthropology, University of Oslo, and works as Director of Research, part-time, at the Department of Archaeology and Anthropology, University of Cambridge. He studied medical zoology in Hamburg and Copenhagen and social anthropology in Copenhagen and Cambridge. Since 1993 he has worked in western Kenya, where he first conducted parasitological research for a PhD in zoology, and then several years of ethnographic fieldwork, first based in a village, studying societal change (including the effects of AIDS) through a focus on material contact, or touch, and its role in everyday ritual practice. This work for his doctorate in anthropology became part of the book (with Ruth J. Prince) ‘The Land is Dying’. More recently, he conducted fieldwork in the city of Kisumu, where he studied transnational scientific collaboration in medical research.