Biogeochemisty and cycling of phosphorus (organic and inorganic) and associated bioactive elements (C, N, S) in marine, lacustrine, and riverine systems.
Nutrient limitation of biological productivity in the ocean.
Sediment diagenesis: organic matter reactivity and mineral authigenesis.
Geochemistry of redox sensitive elements: the effect of redox chemistry on element cycling.
Use of geochemistry of modern environments to interpret the sedimentary record.
