Spencer Wells is a leading population geneticist, documentary filmmaker and author of The Journey of Man and Deep Ancestry. He received his PhD from Harvard University in 1994 and conducted his post-doctoral training with Luca Cavalli-Sforza at Stanford University. His landmark research findings from a field study that encompassed 25,000 miles of Asia and the former Soviet republics led to advances in the understanding of the male Y chromosome and its ability to trace ancestral human migration. He was previously director of the Population Genetics Research Group at the Wellcome Trust Centre for Human Genetics at Oxford and was recently appointed Frank H.T. Rhodes Visiting Professor at Cornell University. Wells is currently National Geographic Explorer-in-Residence and spearheads the Genographic Project. He lives with his wife, a documentary filmmaker, in Washington, DC.