My current research interests involve the use of organic biomarkers and stable and radioactive isotopes to examine 1) aquatic biogeochemical cycling 2) historical changes in marine carbon burial and atmospheric gas concentrations, 3) microbial and vascular plant biomarkers in sediments as recorders of paleoclimate, paleoecology, and geochemical processes, and 4) the fate and transport of organic contaminants in aquatic systems.