Sir John Cadman (1877-1941) was a British mining engineer, petroleum technologist, public servant, and the 1st Baron Cadman. He was educated at Armstrong College, University of Durham, and received a first-class honors in Geology in 1899. 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 1907, Cadman married Lilian Harrigan, they had four children, daughters Marguerite and Sybil, and sons John and Denys. Cadman later went on to teach petroleum engineering at Birmingham University in the UK and was credited with creating the course "Petroleum Engineering". He was director of the Petroleum Executive and later became the Chairman of the Anglo-Persian Oil Company in the 1930s. He also joined a venture by Henri Deterding of Royal Dutch/Shell to stabilize petroleum prices. On June 7, 1937 he was raised to the peerage as Baron Cadman, of Silverdale in the County of Stafford. Sir John Cadman died on May 31, 1941.