Professor Alex L. Sessions is a prominent scholar in the field of Geobiology, with a focus on hydrogen and carbon isotopic studies within organic geochemistry and microbial biogeochemistry. His research emphasizes the natural microbial processes that regulate the production and preservation of marine sedimentary organic matter. Dr. Sessions has developed new stable-isotopic methods to investigate complex organic materials within microbial ecosystems, contributing significantly to our understanding of organic matter dynamics and microbial interactions. His academic journey includes a Bachelor of Arts from Williams College in 1991, a Master of Science from Dartmouth College in 1996, and a Ph.D. from Indiana University, Bloomington in 2001. He began his tenure at California Institute of Technology in 2003 as an Assistant Professor, advancing to Associate Professor in 2010, and achieving full professorship in the same year, continuing to shape the field of Geobiology.