Ashwin Vasavada is a Senior Scientist at NASA's Jet Propulsion Laboratory at Caltech. He researches the climate history of Mars, the weather on Jupiter and Saturn, and polar ices on Mercury and the Moon. He has been involved with several NASA spacecraft missions, including the Galileo Mission to Jupiter, the Cassini Mission to Saturn, Mars Polar Lander, and Mars Odyssey. Currently he is the Project Scientist on the Mars Science Laboratory rover ("Curiosity") mission.
Biographical information from Ashwin's website.