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The Geobiology specialization within GPS brings together researchers and students studying the interactions between living systems and Earth's physical processes. Our investigations cover vast timescales, from life's origins and development on the primitive Earth to its presence in extraordinary extreme habitats and its influence on contemporary biogeochemical systems. This research frequently crosses traditional disciplinary lines, integrating geology, geochemistry, environmental studies, microbiology, and genetic science. We provide both bachelor's degree options and doctoral programs. Graduates and postdoctoral researchers pursue academic careers across biological and Earth sciences, as well as positions in diverse industries including pharmaceutical development, genetic research, and medical fields. Caltech's geobiology researchers address these fundamental questions by studying present-day organisms, tracing evolutionary relationships, and analyzing geological evidence.