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Luigi Luca Cavalli-Sforza - Emeritus Professor of Genetics, Stanford University interviewed by Federica Crivellaro 5th December 2006 wikipedia

James Z. Lee - Research Professor, Population Studies Center, University of Michigan interviewed by Alan Macfarlane 17th August 2002 Michigan University

Tony Wrigley - Honorary Research Fellow, Cambridge Group for the History of Population and Social Structure interviewed by Alan Macfarlane 23rd July 2007 Wikipedia entry