John Bryce McLeod. 23 December 1929 — 20 August 2014

J. B. McLeod was a brilliant solver of problems in mathematical analysis, primarily differential equations. He received his FRS in 1992, and the citation reads in part: ‘Distinguished for many significant contributions to applied analysis, particularly to the theory of partial differential equations with applications to practical problems. … By the exemplary precision and power of his publications and his lectures, he has become internationally recognized as the leading British authority on the useful applications of functional analysis.‘ In addition, in 2011 McLeod was awarded the Naylor Prize and Lectureship of the London Mathematical Society ‘in recognition of his important and versatile achievements in the analysis of nonlinear equations arising in applications to mechanics, physics, and biology.’ He collaborated widely, and was a resource for many applied mathematicians who wanted to have a more rigorous foundation for their work. He leaves a hole that will be hard to fill.