Alex L. Sessions
Nico and Marilyn van Wingen Professor of Geobiology
B.A., Williams College, 1991; M.Sc., Dartmouth College, 1996; Ph.D., Indiana University (Bloomington), 2001. Assistant Professor, Caltech, 2003-10; Associate Professor, 2010; Professor, 2010-23; van Wingen Professor, 2023-.
Professor Sessions focuses on hydrogen and carbon isotopic studies of organic geochemistry and microbial biogeochemistry, with an emphasis on natural microbial processes regulating the production and preservation of marine and sedimentary organic matter. Also the development of new stable-isotopic methods for investigating complex organic materials and microbial ecosystems.
Research Summary: hydrogen and carbon isotopic studies of organic geochemistry, microbial biogeochemistry