 Their approach has emphasized the role of geographical factors in shaping human evolution, and a central role for dispersals as the process by which diversity evolves.He has co-led expeditions and archaeological excavations with Mirazon Lahr in the Solomon Islands, the Central Sahara, and Kenya, particularly in the Turkana Basin.In Turkana, Foley and Mirazon Lahr study the late Quaternary record of human occupation in the basin, and have recently described a group of 10,000 year-old skeletons from the site of Nataruk that died as part of conflict between hunter-gatherer bands.