Person: Whittaker (2), John
John Macnaghten Whittaker worked in Quantum Mechanics and Complex Analysis. He became ViceChancellor of Sheffield University.
Mathematical Profile (Excerpt):
 Whittaker attended Fettes from 1918 until 1920 during which time he was introduced to calculus.
 One of the first papers the Whittaker wrote solved a problem mentioned by Pollard in his lectures and it appears that Pollard's lectures had the most influence on the direction of his mathematical interests.
 Whittaker accepted the chair of pure mathematics at the University of Liverpool in 1933.
 The teaching of pure mathematics was his responsibility, while teaching applied mathematics was the responsibility of L Rosehead who was appointed to the Applied Mathematics Chair at the same time as Whittaker.
 Jack and Iona had two sons, John Edmund Whittaker born on 19 November 1934 and Richard James Whittaker born on 6 February 1938.
 By 1938 war seemed almost inevitable so Whittaker joined the emergency research officers.
 Whittaker returned to his chair at Liverpool in October 1945 and became involved in administrative duties such as being Dean of Science from 1947 to 1950.
 Let us now look at Whittaker's contributions to mathematics.
 He was interested over many years in expanding functions in a series of polynomials and Whittaker's constant is named after him.
 The first of these contains a result, which Whittaker correctly attributed to Takenaka, which shows that, with an added technical condition, an entire function every derivative of which has a zero in the unit disk is necessarily a constant.
 The constant has become known as Whittaker's constant despite the result being originally due to Takenaka.
 In many ways this work can be seen as Whittaker's greatest achievement and he was awarded the prestigious Adams Prize by Cambridge University for this work in 1949.
 In 1965 Whittaker retired as ViceChancellor and enjoyed his mathematics again.
Born 7 March 1905, Cambridge, England. Died 29 January 1984, Sheffield, England.
View full biography at MacTutor
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Origin England
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References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive