Leslie Fox (1918-1992) was director
of the Oxford University Computer Laboratory
Professor of Numerical Analysis at Oxford University,
and Fellow of Balliol College.
He was a distinguished researcher in numerical linear
algebra and differential equations.
More information about him can be found in the references below.
Leslie Fox at the MacTutor History of
Leslie Fox at Wikipedia.
Leslie Fox at the Mathematics_Genealogy_Project
(note that the details there are incomplete).
by D. F.
Mayers (University of Oxford) and J. E. Walsh (University of
Manchester), Bulletin of the London Mathematical Society 31
(1999), 241-7, including a list of ninety publications
by C. Clenshaw in The Independent
(Oxford University Computing Laboratory, 1994, 77 pages)
titled Leslie Fox 1918-1992
containing two Addresses given at Memorial Service and
biographical and other information.