Whilst at Oxford he was awarded a Doctor of Philosophy degree in 1967 for research on Many-body theory supervised by W. E.
[3] His early research was on the application of scaling theories to magnetic spin systems and superfluidity, and contained a series of useful results on critical indices.
[3] He then applied renormalisation group ideas to polymer solutions and clarified the relationship of this approach to previous theories; a particularly interesting result concerned the retrieval of the Flory index under approximation schemes.
[3] After some work on critical behaviour on surfaces, he joined the (then) new spin glass field, and in collaboration with Alan Bray[7] wrote a series of important papers both on replica symmetry breaking in these systems and on their properties as revealed by computer simulation.
[3] “All text published under the heading 'Biography' on Fellow profile pages is available under Creative Commons Attribution 4.0 International License.” --"Royal Society Terms, conditions and policies".