Chris Ruf is a Professor of Climate and Space Science, Electrical Engineering, and Applied Physics at the University of Michigan, USA, and Principal Investigator of the NASA Cyclone Global Navigation Satellite System (CYGNSS) mission. He has worked previously at Intel Corporation, Hughes Space and Communication, the NASA Jet Propulsion Laboratory, the Pennsylvania State University, and the Technical University of Denmark. Dr. Ruf has served on two Earth Science Decadal Survey Panels of the US National Academy of Sciences and Engineering, has been a team member of numerous NASA and DoD spaceborne missions in Earth and planetary science, and is former Editor-in-Chief of the IEEE Transactions on Geoscience and Remote Sensing. His research interests include remote sensing methods and technology, with applications to atmospheric, oceanic and terrestrial prediction and process studies.