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About

D. Y. Sumner is a leading geobiologist and planetary scientist whose research bridges Earth’s most extreme environments and the sedimentary record of Mars. Her work centers on understanding microbialite formation, sedimentology, and habitability—both in terrestrial analog sites and on the Red Planet. Sumner’s most influential contribution is her leadership of the Mars Hand Lens Imager (MAHLI) investigation on NASA’s Curiosity rover, detailed in a 2012 paper with 229 citations. This 2-megapixel color macro camera has been essential for revealing grain-scale textures and mineralogy in Gale crater’s sedimentary rocks. She also co-authored a landmark 2018 study (126 citations) that identified plunging river plume deposits in the Murray formation, providing key evidence for ancient lacustrine environments on Mars. On Earth, Sumner has been instrumental in the Pavilion Lake Research Project, an analog science initiative that uses underwater microbialite communities to prepare for human exploration of the Moon and Mars. Her integrated approach—linking field analog studies with rover-based Mars exploration—has profoundly shaped our understanding of past habitability and sedimentary processes beyond Earth.