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1 (of 5) Portrait of John Clarke.

Courtesy of Darwin College, Cambridge.

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2 (of 5) John Clarke and student Andrew Miklich with Magnetcardiology, May 1991.

Photo: © 2010 The Regents of the University of California, Lawrence Berkeley National Laboratory

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3 (of 5) John Clarke in the 1990s.

Photo: Cavendish Laboratory, Cambridge University

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4 (of 5) John Clarke, 5th from the left, in his student days at Cambridge University. Year: 1966.

Photo: Cavendish Laboratory, Cambridge University

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5 (of 5) John Clarke in his student days at Cambridge University.

Photo: Cavendish Laboratory, Cambridge University