A worlwide collection of outstanding papers on human migration from internationally renowned scholars that presents a convincing case of the impossibilty of "pure" races, cultures, and languages, as well as returning this study to its rightful place among the known processes of human evolutionary change and variation.

Peter N. Peregrine is professor and chair of anthropology at Lawrence University, Appleton, Wisconsin. He is coeditor of the Encyclopedia of Prehistory and has authored or coauthored eleven books, five edited volumes, and over 100 articles, chapters, and reviews.

Ilia Peiros is a research associate at the Santa Fe Institute and an affiliate of the Department of Linguistics and Applied Linguistics at the University of Melbourne, Australia. He is a historical and comparative linguist.

Marcus W. Feldman is professor of biology at Stanford University. He is managing editor of Theoretical Population Biology and associate editor of Genetics, Human Genetics, Annals of Human Genomics, Annals of Human Biology, and Complexity.