Luigi Luca Cavalli-Sforza is Professor of Genetics Emeritus at Stanford Medical School, and Member of the U.S. National Academy of Sciences. His books include "History and Geography of Human Genes" and "Genes, Peoples, and Languages." Antonio Moroni is Professor Emeritus of Ecology at the University of Parma (Italy) and member of the National Academy of Sciences (Academy of XL). Gianna Zei was Professor of Statistics and Biometry at the University of Pavia and directs the population genetics group of the CNR Institute of Molecular Genetics in Pavia.