"Leslie Fox" was a United Kingdom/British mathematician noted for his contribution to numerical analysis.

Fox studied mathematics as a scholar of Christ Church, Oxford graduating with a First in 1939 and continued to undertake research in the engineering department. While working on his Doctor of Philosophy/D.Phil. in computational and engineering mathematics under the supervision of Sir Richard Southwell he was also engaged in highly secret war work. He worked on the numerical solution of partial differential equations at a time when numerical linear algebra was performed on a desk calculator. Computational efficiency and accuracy was thus even more important than in the days of electronic computers. Some of this work was published after the end of the Second World War jointly with his supervisor Richard V. Southwell/Richard Southwell.

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My body felt as if it was on fire. I just wanted to tear it off.

I was absolutely loath to have to go back there, and I went back with great apprehension.