My grandmother Joan Krakover Hall, who has died aged 94, was a passionate teacher and linguist, who worked for a time at Anglia Ruskin University in Cambridge. She was married for more than 50 years to the atomic physicist Theodore Hall, whom she met as a teenager in Chicago after the second world war.
As a young scientist working on the Manhattan Project, Ted had passed secrets of the atomic bomb to the Soviet Union, believing that a US nuclear monopoly would be highly dangerous. Identified as an agent in 1949, he was never prosecuted by the US authorities and his role remained unknown to the public until the mid-1990s.
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