Kenneth A. Farley is a noble gas isotope geochemist and Professor of Geochemistry at the California Institute of Technology. He holds the W. M. Keck Foundation professorship and was the chairman of the Division of Geological and Planetary Sciences at Caltech from 2004 to 2014. Farley specializes in the study of the accumulation of cosmic dust in seafloor sediments through analysis of the presence of Helium-3, and in the isotopic composition of mid-oceanic and volcanic island basalts.