• Biogeochemistry of natural and perturbed systems: river, esturarine and marine systems
  
• Isotope effects: observations and first principles modeling
• Methods development: light stable isotopic analyses in water, carbonates, compound specific isotope analysis, high mass/high resolution isotopologue analyses
• Paleoenvironment and paleoclimate: observations, reconstruction, synthesis, analysis
• Proxy system modeling: of the processes by which natural archives are imprinted by environmental sensors
• Surficial processes: observations, modeling, analysis