Dr. Dan McCleese is American chief scientist for NASA’s Jet Propulsion Laboratory. In this role he is responsible for leadership of the scientific and research community at the laboratory, and serves as the focal point for interactions with universities and the external research community. He is the principal investigator for the Mars Climate Sounder instrument on NASA’s Mars Reconnaissance Orbiter.
Between 1994 and 2006, McCleese served as JPL’s chief scientist for Mars exploration, working with the international science community to establish the present and future strategy for exploring Mars. He has worked on NASA missions to study Earth’s atmosphere, Venus and Mars. He has also been a visiting associate in planetary science at Caltech since 2000, and in 2005 he received NASA’s Outstanding Leadership Medal.
Source- JetPropulsionLaboratory http://www.jpl.nasa.gov/bios/mccleese/