John Benjamin Sainsbury (1871–1956), eldest son of John James Sainsbury and Sainsbury's chairman 1928-1956
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He became a director of the Company, then known as J. Sainsbury Ltd., in 1933 and became joint managing director of Sainsbury's with his brother Robert Sainsbury in 1938 after his father, John Benjamin Sainsbury (the eldest son of Sainsbury's founder John James Sainsbury), had a minor heart attack.