Akinyinka Akinyoade, PhD (2007), International Institute of Social Studies Den Haag, is a Senior Researcher at the African Studies Centre, Leiden. He has published books and articles on irregular migration, and fertility dynamics in West Africa. He is currently working on food and water security scenarios for Africa 2050.Jan-Bart Gewald, PhD (1996), Leiden University, is a Senior Researcher at the African Studies Centre, Leiden and Professor of History at Leiden University. He has published extensively on aspects of southern African History and is currently working primarily on Zambian history.