A synopsis of Whittle's thesis also appeared as an appendix to the second edition of Wold's book on time-series analysis.
[1][3][6] After six years in Manchester, Whittle returned to Cambridge as the Churchill Professor of Mathematics for Operational Research, a post he held until his retirement in 1994.
[9] The Royal Society awarded him their Sylvester Medal in 1994 in recognition of his "major distinctive contributions to time series analysis, to optimisation theory, and to a wide range of topics in applied probability theory and the mathematics of operational research".
[8] In 1986, the Institute for Operations Research and the Management Sciences awarded Whittle the Lanchester Prize for his book Systems in Stochastic Equilibrium (ISBN 0-471-90887-8) and the John von Neumann Theory Prize in 1997[6] for his "outstanding contributions to the theory of operations research and management science".
[11] In 1951, Whittle married a Finnish woman, Käthe Blomquist, whom he had met in Sweden.