Sarah Stewart Johnson

Assistant Professor of Planetary Science, Johnson Biosignatures Lab

Georgetown University

About Sarah Stewart

Sarah Stewart Johnson is an assistant professor of planetary science at Georgetown University. Her lab focuses on detecting biosignatures, or traces of life, and is involved with analyzing data from current spacecraft and devising new techniques for future missions. A former Rhodes Scholar and White House Fellow, she received her PhD 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 first book, The Sirens of Mars: Searching for Life on Another World, will be released in July.