I am Dr. Chelsea M. Comans. I am a paleoecologist and stable isotope geochemist who studies the ecology and evolution of ancient marine ecosystems. My research focuses on the use of stable oxygen, nitrogen, and zinc isotopes in preserved vertebrate tooth enamel(oid) to reconstruct body temperatures, trophic positions and interactions, and environmental conditions in Late Cretaceous through Cenozoic marine ecosystems. I am particularly interested in understanding the origin and evolution of endothermy, gigantism, and trophic positions in sharks and how these ecological and physiological innovations interacted to influence evolutionary success through time. In Fall 2026, I started a lecturer position in Earth surface processes in the Department of Geological Sciences at the University of Florida (https://geology.ufl.edu/).