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John Cadman, 1st Baron Cadman FRS, GCMG (7 September 1877 – 31 May 1941) was a British mining engineer, petroleum technologist and public servant.
Cadman served as Inspector of Mines in Trinidad and Tobago in the first decade of the 20th Century. At that time Trinidad and Tobago was a British Colony. As Inspector of Mines he was responsible for the commercialization of Trinidad's oil in 1907. In this effort Cadman was joined by Arthur "Beeby" Thompson who was an engineer with oilfield experience in Russia.
Cadman would later go on to teach petroleum engineering at the Birmingham University in the U.K. Cadman is credited with creating the course "Petroleum Engineering".
He was later an executive of the Anglo-Persian Oil Company in the 1930s. He expanded production fourfold and eventually joined a venture by Henri Deterding of Royal Dutch/Shell to stabilize petroleum prices.
1941 Obituary 
1941 Obituary