The core focus of the research carried out by our group is to investigate biogeochemical processes occurring at the earth surface using a combination of  tools including isotope geochemistry, geochemical and reactive transport modeling and geochronology. Field-based environmental measurements are coupled with experimental or detailed characterization studies in order to develop conceptual and numerical models. The primary goal of this research is to understand how Earth's environments are controlled by the feedbacks between chemical, biological and physical processes in the subsurface.