Dunham studied at Harvard University under a Commonwealth Fund Fellowship, which led to a master's degree. He returned to the UK as a geologist for the British Geological Survey, working on the iron ores of Cumbria. This came in useful during the Second World War where he was involved in the investigation of the mineral resources of the North of England. This work was later published in the classic volume, The Geology of the North Pennine Orefield. Dunham returned to Durham University in 1950 as Professor of Geology. During his tenure he supervised the drilling of the Rookhope borehole discovering, as predicted by his colleague Martin Bott, the presence of a concealed granite underlying the Pennines. He was created a Fellow of St John's College, Durham. In 1967 his career culminated in accepting the directorship of the British Geological Survey, and like his time at Durham, successfully guided that institution through a period of rapid growth into areas such as geophysics, oceanography and geochemistry. He was knighted in 1972. Following retirement in 1975, Dunham again returned to Durham as Emeritus Professor, publishing further work on the mineralogy of the North of England.
Honours
Kingsley Dunham received many honours. He was elected a Fellow of the Royal Society in 1955 and received its Royal Medal in 1970. He was President of the Yorkshire Geological Society between 1958–59, and was awarded the Sorby Medal of that Society in 1963. In 1973 he gave the presidential address to the British Association meeting in Canterbury. Dunham also received honorary doctorates from more than ten universities, both at home and abroad. He was awarded the Wollaston Medal of the Geological Society of London in 1976. Between 1990 and 2012 the British Geological Survey's headquarters complex, in Keyworth, Nottinghamshire, was named the Kingsley Dunham Centre in his honour. The relocation and consolidation of the BGS's various, disparate branches to the Keyworth site was one of the lasting legacies of Dunham's time as Director. The Centre opened in 1976, shortly after Dunham's retirement.
Later life
In his later years his eyesight failed him until he was totally blind. However he still attended the weekly Durham meetings, held by the Arthur Holmes society. His son Ansel, who predeceased him, was Professor of Geology at the University of Hull and the University of Leicester.