Clarence Norman Fenner (19 July 1870 – 24 December 1949) was an American geologist who specialized in petrology, particularly the transformations of silica minerals.
Fenner's mother was Elmina Jane, daughter of country physician Dr Carpenter.
Fenner was educated at private schools and travelled to Europe with his tutor McChesney in 1888.
He went to work for mining companies in Canada, Mexico and other places before joining Columbia University again for a master's degree (1909) and a doctoral (1910).
[1][2] During World War I, the lab was involved in the production of glass for optical instruments and Fenner was put in charge of the Spencer Lens Company.