Lecturer in Social Anthropology, University of Khartoum, Sudan, 1964-69; research and visiting positions in Oxford, aarhus (Denmark, and Bergen (Norway), 1969-72; University Lecturer in Social Anthropology, University of Oxford, and Fellow of St Cross College, 1972; appointed Professor in 1996. Fellow of the British Academy, 1999; President, Royal Anthropological Institute, 2001-; Vice-President, British Institute in Eastern Africa, 2001-. (For list of publications see APF).