Dr. Ellen Stofan was the NASA chief scientist (2013-2016), serving as principal advisor on the agency’s science programs. Prior to her appointment, Stofan was vice president of Proxemy Research and an honorary professor in the department of Earth sciences at University College London in England. Her research has focused on the geology of Venus, Mars, Saturn’s moon Titan, and Earth. Stofan is an associate member of the Cassini Mission to Saturn Radar Team and a co-investigator on the Mars Express Mission’s MARSIS sounder. She was also principal investigator on the Titan Mare Explorer, a proposed mission to send a floating lander to a sea on Titan. Stofan holds master and doctorate degrees in geological sciences from Brown University in Providence, Rhode Island. She is a Fellow of the Geological Society of America and the Explorers Club.