Sarah Stewart Johnson's research is driven by the underlying goal of understanding the presence and preservation of biosignatures within planetary environments. Her lab is also involved in the implementation of planetary exploration, analyzing data from current spacecraft as well as devising new techniques for future missions. A former Rhodes Scholar and White House Fellow, she received her Ph.D. from MIT and has worked on NASA’s Spirit, Opportunity, and Curiosity Rovers. She is also a visiting scientist with the Planetary Environments Lab at NASA’s Goddard Space Flight Center. Her recent book, The Sirens of Mars, was a New York Times Editor's Choice and selected as one of the New York Times 100 Notable Books of 2020.