His primary science interest is to understand the physico-chemical and dynamical processes governing Solar System bodies and extrasolar planets and driving their evolution. His own work includes the study of planetary and satellite atmospheres and of distant small bodies (trans-Neptunian objects, comets). He uses mostly observational approaches, both ground-based and space-borne, with emphasis on sub-mm and infrared spectroscopy. He is also closely following the growing field of characterization studies of extrasolar planets and their atmospheric properties.