Mwenda Ntarangwi teaches anthropology at Augustana College, Rock Island, Illinois, and is the author of Gender Identity and Performance (2003, Africa World Press). Mustafa Babiker teaches anthropology at the University of Khartoum. His research and development consultancies address issues of social change within pastoral communities. David Mills lectures at the University of Birmingham. He has just finished a book on the political history of British social anthropology.