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Raymond L. Heacock (January 9, 1928 – December 20, 2016) was an American engineer who spent his career at NASA's Jet Propulsion Laboratory where he worked on the Ranger program in the 1960s and on the Voyager program in the 1970s and 1980s. A Caltech engineering graduate, he was the winner of the James Watt International Medal for 1979.