Current Research Interests

Biogeochemical cycles, low temperature sedimentary geochemistry, atmosphere/ocean evolution

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Modeling Anoxia and Euxinia in Earth History

Causes and Consequences of end-Permian Extinction

Carbon Cycle Perturbations during the Paleocene-Eocene Thermal Maximum

What Caused the Current Ice Age? Focus on the Eocene-Oligocene Transition

What Caused the Rise of Atmospheric Oxygen

Weathering and Soil Formation before Land Plants 

Fate of Wastewater Nutrients in Florida Keys Groundwaters 

Interpreting Stable Isotope Excursions in Ancient Sedimentary Rocks 

Controls on Chemical Erosion