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J. J. Thomson was an influential physicist, both for his own research, for which he won the Nobel Prize, and for the work he did to establish the Cavendish Laboratory at Cambridge as a major research school. He began his career studying the theory of electricity which built on the work of James Clerk Maxwell. In 1897 he discovered the particle later named the electron, the existence of which was first announced at a Friday Evening Discourse at the Royal Institution (Ri).