My research utilizes analytical and modeling techniques to understand the global biochemical effects of ancient climate perturbation. This research requires assimilating broad Earth system topics and new analytical approaches, with modern proxy development, to address a variety of spatio-temporal questions that are at the nexus of chemical oceanography, paleoceanography, stable isotope systematics, and geochemical modeling. The modern ocean is experiencing marine deoxygenation due to multiple factors, all are associated with climate change and suggest continued loss but the rate, magnitude, and specific drivers are unknown. Thus, understanding natural variability and the associated feedbacks of ocean deoxygenation during ancient climate perturbations is our only window to constrain future outcomes. Until recently the necessary proxies for detecting ancient initial global ocean deoxygenation were not available. This issue has driven my lab group's research over the last five years which has focused on developing and applying new tools to understand the natural variability of marine oxygen during major climate events. We combine tradiatioal approaches – various phases of carbon and sulfur isotopes, elemental concentrations, and mineralogy – and novel isotope systems – thallium, vanadium, molybdenum, mercury, and uranium. I particularly welcome applicants interested in combining proxy records to better constrain the natural climatic feedbacks and understanding various Earth surface processes during climatic perturbations.