In 1928 Galbraith succeeded
Reginald Poole as lecturer in
diplomatic, and was elected a tutorial fellow of Balliol. Between pursuing his teaching, lecturing, discussion, and golfing he continued working on chronicles and charters, including the
St Albans Chronicle, 1406–20, published in 1937. Before the end of the year he took up the professorship of history at
Edinburgh University. In 1940, he was elected
Ford's lecturer. In 1944 Galbraith succeeded
Albert Frederick Pollard as director of the
Institute of Historical Research. That same year, in his lecture entitled "Good Kings and Bad Kings in Medieval History", he challenged the overall reliance of historians on the chroniclers whose works were often emotional judgments than constructive criticisms of contemporary figures, concluding that
William Rufus and
King John were more misrepresented than any other monarch due to conflict with the clerical hierarchy. In January 1948 Galbraith succeeded Sir
Maurice Powicke as
Regius Professor of Modern History. He was elected an
honorary fellow of Balliol in 1957, and of
Oriel in 1958. Galbraith intensely disliked
Hugh Trevor-Roper and in 1951 threatened to resign if Trevor-Roper was appointed to the Chair of Modern History. This animosity was reciprocated, Trevor-Roper accusing Galbraith of contributing to a provincial and backward-looking culture in the study of history at Oxford. Galbraith blocked Trevor-Roper's application to give the
Ford Lectures in 1956. Galbraith's works include a reappraisal of the purpose of
Domesday Book, a series of critically edited texts and translations of medieval sources, his work between 1942 and 1974 resulting in
Domesday Book: Its Place in Administrative History, published by
Oxford University Press on 23 January 1975. His 1957 essay on the structure of
Henry Knighton's Chronicle successfully proved that Knighton most likely wrote its final two volumes, rather than the
Continuator of Knighton who had previously been suggested. Galbraith retired as Regius Professor of Modern History in 1957. Galbraith's retirement precipitated a celebrated contest for election to the Regius Professorship which resulted in the election of
Hugh Trevor-Roper, despite popular support for
A. J. P. Taylor and Galbraith's wish to see
R. W. Southern appointed. Galbraith died on 25 November 1976 at his home at 20A Bradmore Road, Oxford. ==Personal life==