His main interest is the role of streams, rivers, and coastal systems in the earth's carbon cycle. His research aims to understand the controls on the age of carbon in rivers, the factors governing the lateral transport of watershed carbon, the impact of terrestrial transfers on the carbon budget of riverine and coastal ecosystems and the controls of air-water CO2 exchange in coastal systems. In addition to his current position at the Yale School of Forestry and Environmental Studies, he is an associate editor for the Journal of Geophysical Research-Biogeosciences and on the executive committee of the Yale Climate and Energy Institute (Past member)