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Catherine D. McLeod is a leading space radiation physicist whose work directly informs the safety of long-duration human spaceflight. Her primary research areas include space radiation measurement, dosimetry, and the biological risk assessment of galactic cosmic rays and solar particle events. Dr. McLeod’s most significant contribution is her pioneering work on the Artemis I lunar mission, where she led the first comprehensive radiation measurements beyond low Earth orbit in decades. Her 2024 paper on this topic, already garnering 30 citations, provides critical data for understanding the deep-space radiation environment and its implications for astronaut health. This landmark study has become a foundational reference for NASA’s Artemis program and future Mars missions. Beyond this, Dr. McLeod has advanced the characterization of trapped particle radiation and its effects on spacecraft shielding. Her research is instrumental in developing countermeasures against cancer, cataracts, and degenerative diseases caused by space radiation. With a growing citation impact, she is recognized as a key voice in preparing humanity for a sustainable presence beyond Earth.