After the war he held a variety of positions as an economic geologist. During World War II, he worked as an advisor on oil explorations for the Turkish Government (1940-43) and then joined his country's war effort as the director of economic warfare, Netherlands Army (1943-45).
at the University of Leiden in geology in 1932.Īfter military service (1932-33), Tromp was a field geologist for oil companies in Indonesia and Egypt from 1933 to 1940. He moved to Europe for his education and earned his Ph.D. Tromp was born on March 9, 1909, at Djarkarta, Indonesia. Geophysicist, director of the Bioclimatological Research Center, Leiden, Netherlands, and writer on parapsychological subjects.
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