Riccardo Notarpietro is assistant professor since 2006 at the Politecnico di Torino. He received his Ph.D. in 2001 with a thesis on the atmosphere remote sensing exploiting GPS measurements from space and from ground. His fields of activities included also electromagnetic wave propagation, radarmeteorology, and more recently, GNSS-Reflectometry. He has been Visiting Scientist at EUMETSAT and DMI for GNSS Radio Occultation data analysis. He is actually working at EUMETSAT, providing scientific support to the development of the Radio Occultation payload and ground segment for the Second Generation of the Eumetsat Polar System (EPS-SG) program.