Hayes, John M.
John Hayes is Director of the National Ocean Sciences Accelerator Mass Spectrometry Facility and senior scientist at Woods Hole Oceanographic Institution. He has made important contributions to the understanding of the Earth's carbon cycle and he has demonstrated the importance of methanogenic bacteria in ancient ecosystems, discovered the large fluctuations in the isotopic composition of carbon in seawater just before the Cambrian evolutionary explosion, and pioneered exploitation of the isotopic composition of biomarkers in such studies. In 1966, he was a research associate in cosmochemistry at Enrico Fermi Institute at the University of Chicago. He served as a senior scientist at NASA's Ames Research Center,1967-68, and was a NATO fellow in organic chemistry at the Organization of Geochemistry Research Unit, Bristol, England, 1969. Hayes served as Distinguished Professor of Biogeochemistry at Indiana University at Bloomington prior to his position at Woods Hole. From 1971 to 1979, he served as a consultant to NASA Headquarters.