As an atmospheric chemist, he has studied alkene ozonolysis, vehicle emissions, aircraft emissions, oil-spill emissions, and aerosol chemistry. His current research will continue to focus on unimolecular reaction dynamics of ozonolysis reaction intermediates and emissions from complex hydrocarbon mixtures. New research will focus on microscopy of aqueous aerosol to understand the fundamental effects of extremely concentrated conditions on aerosol chemistry using confocal Raman microscopy.