James Raymer, Division of Social Statistics, School of Social Sciences, University of Southampton. Having taught or carried out extensive research in the field of migration for the last 10 years, Dr Raymer is well respected amongst the community. He has published numerous papers in a variety of international journals and has conducted many professional presentations on this field by invitation. Frans Willekens, Netherlands Interdisciplinary Demographic Institute (NIDI), The Hague. Director of NIDI, Professor Willekens is renowned as one of the best names in migration, and a leader in statistical approaches in the field.