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	+ NASA Home + Center Home		Roger Summons Roger Summons is one of the leading organic geochemists in the world. His work has revealed substantial new clues about the Proterozoic oceanic environment and he has made numerous significant contributions to fundamental work on changes in the distribution of chemical fossils with time. He is currently a professor in the Department of Earth, Atmospheric and Planetary Sciences at Massachusetts Institute of Technology where he studies lipid chemistry of geologically significant microbes and microbially dominated ecosystems; organic and isotopic indicators of climate change, biotic evolution and mass extinction; Age- and environment-diagnostic biomarkers in sediments and petroleum; Archean, Proterozoic and extraterrestrial biogeochemical fossils.  Previously, Dr. Summons was Chief Research Scientist at the Australian Geological Survey Organization in Canberra and is a Fellow of the Australian Academy of Science. NASA Ames Research Center
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