Elworthy was born on 21 December 1940. He was educated at
Bristol Grammar School, and in 1959 went up to
Merton College, Oxford to read Mathematics as an undergraduate. In 1964 he married Susan Margaret Anderson. His DPhil was completed in 1967 under the supervision of
Michael Francis Atiyah at the University of Oxford. Before his retirement from Warwick, he held a personal chair there. Together with
Xue-Mei Li and
Yves Le Jan he wrote the books "The Geometry of Filtering" and "On the Geometry of Diffusion Operators and Stochastic Flows". ==References==