Russell King is Professor of Geography at the University of Sussex, and Director of the Sussex Centre for Migration Research. He has been researching migration in its various forms around the world for over 30 years; his main research projects have been on Europe and the Mediterranean, including studies on Italian return migration, Irish migration, British retirement migration to Southern Europe, international student migration, migration and development in Albania, and Greek and Cypriot diasporas. He is the editor of the Journal of Ethnic and Migration Studies. Richard Black is Professor of Human Geography at the University of Sussex, and Head of the School of Global Studies. His recent research has focused on the relationship between migration and poverty, but he has also conducted research on refugees, the integration of economic migrants from Eastern Europe in the UK, and the relationship between migration and climate change. His main geographical focus is Sub-Saharan Africa, but he has also carried out field research in Portugal, Greece and the Western Balkans. During 1994-2009 he was co-editor of the Journal of Refugee Studies. Michael Collyer is Lecturer in Human Geography and Migration Studies at the University of Sussex. Whilst based at Sussex he has held a Nuffield Career Development Fellowship and a Marie Curie International Fellowship, with visiting appointments at universities in Morocco, Egypt and Sri Lanka. His research is on forced, undocumented and temporary forms of migration. He is an associate editor of the Journal of Ethnic and Migration Studies. Anthony Fielding is Research Professor in Human Geography at the University of Sussex, and has been researching migration for over 40 years. His main geographical focus is on Europe and East Asia, and he has been a visiting professor at Riksumeikan and Kyoto universities in Japan. His main research projects have been on counter-urbanization in Western Europe; the relationships between social and geographical mobility; theorizing new immigration trends in Southern Europe and East Asia; and, currently, the analysis of internal and international migration flows in China, Korea and Japan. Ronald Skeldon is Professorial Fellow in the Department of Geography at the University of Sussex, and a Senior Research Fellow at the Department for International Development (DfID) in London. His research focuses on migration and development, and on both internal and international migrations. He has particular interests in the measurement of migration and in migration policy, and has acted as consultant to many international organizations. After early field research in Latin America, he has specialized in migration in Asia and the Pacific Region.