Kenneth K. Kidd is Professor Emeritus and Senior Research Scientist in Genetics at Yale University School of Medicine. He joined the Genetics Department at Yale in 1973 and has spent his career there. He has conducted research projects in several areas over the past few years: searching for genes for complex neuropsychiatric disorders, assembling the human genetic map, designing databases for diverse types of human genetic data, exploring the molecular evolution of hominoids, and studying gene frequency variation in humans. His current research is focused on genetic variation among populations around the world. While current funding emphasizes applications of his research to forensic issues (ancestry inference, deconvolution of mixtures of DNA from multiple individuals, reconstructing family relationships, phenotype inference, etc.), the work continues and builds on a strong anthropologic focus that started with his doctoral research. His current research emphasis is on clusters of DNA markers forming haplotypes and analyses of the patterns of disequilibrium seen around the world. The allele frequency variation in more than 100 populations from all major regions of the world and the evolution of haplotypes are providing data relevant to the historic patterns of human diversification. Recent papers from his lab demonstrate a strong founder effect associated with the exodus from Northeast Africa of a single modern human population that expanded and diversified to fill the rest of the world. Other studies of human variation are attempting to quantify the demographic parameters that existed during that diversification and to identify any selection that may have existed at targeted loci, such as those involved in ethanol metabolism and aspects of visible traits such as eye and skin color.