Abstract
Antony Hewish (1924–2021) Pioneer radio astronomer and leader of the team of researchers who identified the first pulsar, remembered by Malcolm Longair. Antony (Tony) Hewish went up to Cambridge University in 1942 to read natural sciences. After his second year, however, he was sent for war service at the Telecommunications Research Establishment, Malvern, where Martin Ryle was head of the radar counter-measures group. Tony worked on devices to jam the radar systems of hostile night-fighters. Returning to Cambridge in 1946, he completed his physics degree and then joined the newly founded radio astronomy group led by Ryle at the Cavendish Laboratory. Tony specialized in the phenomenon of radio scintillation, the twinkling of radio sources caused by plasma irregularities along the line of sight to the source. In 1951–52, he worked out in detail the theory of radio source scintillation (Hewish 1952) and in 1964 the phenomenon was observed in compact radio sources (Hewish et al. 1964). These sources included the recently discovered quasars, among the most extreme examples of active galactic nuclei.
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