Professor John Baldwin was an experimental astrophysicist of the highest distinction who made many innovative contributions to radio and optical astronomy. He pursued his entire research career as a member, and then head, of the Radio Astronomy Group of the Cavendish Laboratory at Cambridge University. His deep understanding and physical intuition for all aspects of interferometry, first at radio and then at optical wavelengths, resulted in a series of ground-breaking telescope systems for astronomy. These led to new approaches to the construction and operation of telescopes in these astronomical disciplines. For a considerable part of his career he was a fellow of Queens' College Cambridge.
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