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S. K. Atreya is a pioneering planetary scientist whose research has fundamentally reshaped our understanding of the atmospheres and interiors of the outer planets and Mars. A central figure in NASA’s robotic exploration program, Atreya’s major contributions span the chemistry, origin, and evolution of planetary atmospheres, with a particular focus on volatile elements and isotopic ratios. His most cited work, "The Sample Analysis at Mars Investigation and Instrument Suite" (2012, 563 citations), details the SAM instrument on the Mars Science Laboratory, which he helped lead. This suite has been instrumental in detecting organic molecules and measuring isotopic compositions in Martian rocks and atmosphere, providing key evidence for past habitability. Beyond Mars, Atreya’s theoretical and experimental work on Jupiter, Saturn, and Titan has explained the formation of clouds, lightning, and the deep interior composition of gas giants. With over 500 publications and numerous NASA awards, including the prestigious Kuiper Prize, Atreya’s legacy is defined by his ability to connect spacecraft data to fundamental planetary processes, inspiring a generation of researchers to explore the chemical fingerprints of our solar system’s origins.