Abram Fedorovich Jaffe (top right, 1880-1960), Soviet physicist, studying isotopes with the Soviet physicist and astronomer Boris V. Numerov (1891-1941). Photographed on 1 March 1935 at the Leningrad Physico-Technical Institute, USSR. Jaffe (sometimes spelt Ioffe) studied electromagnetism, radiology, and semiconductor physics. He also oversaw the expansion of work in radioactivity, superconductivity and nuclear physics. In 1918, he became the head of what would later (after St Petersburg was renamed Leningrad) be called the Leningrad Physico-Technical Institute. It is now called the Ioffe Physico-Technical Institute in his honour. Numerov, along with many others, was executed in 1941 during one of Stalin's purges.
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