Alexander S. Bradley

Alexander S. Bradley is an Associate Professor of Earth, Environmental, and Planetary Sciences at Washington University in St. Louis, serving as Director of Graduate Studies. He holds a PhD from MIT in a related field. His research focuses on the coevolution of life and Earth, integrating organic and isotope geochemistry with microbiology to decode Earth’s biogeochemical history. Key areas include molecular fossils preservation, microbial physiology, and extraterrestrial life detection strategies.

Bradley’s work spans field investigations (e.g., sediment sampling, cave exploration) and laboratory experiments (e.g., sulfur isotope fractionation studies). He teaches foundational courses like Geology in the Field (EEPS 104), emphasizing practical skills in challenging environments. His lab, part of the McDonnell Center for the Space Sciences, explores biogeochemical cycles through modern and ancient samples, with applications to astrobiology and planetary science.

His recent research highlights include sulfur isotope dynamics in microbial systems, organic carbon burial mechanisms during anoxic events, and lipid biomarker responses to environmental changes. The Bradley lab’s projects often involve advanced analytical techniques like SIMS imaging and proteomic analysis.