John C. Hollister attended the University of 

 Oregon and the Colorado School of Mines 

 where he received the Geological Engineering 

 degree in 1932. He joined Plains Exploration 

 Company, Denver, in 1932, as a geophysical 

 engineer. In 1934 he became co-founder of 

 the Heiland Research Corporation in Denver 

 and served as Vice President and General 

 Manager of Heiland until 1949. In 1949 he 

 returned to Colorado School of Mines where 

 he is Professor of Geophysics and Head of 

 the Department of Geophysical Engineering. 

 He is a member of Alpha Tau Omega, Sigma 

 Gamma Epsilon, Tau Beta Pi, Society of Ex- 

 ploration Geophysicists, A. I. M. E., American 

 Geophysical Union, and Denver Geophysical Society. 



William S. Hoffmeister, a native of Balti- 

 more, Maryland, received an A.B. degree 

 from Johns Hopkins University in 1923 and 

 a Ph.D. degree in 1926. In 1926 he was as- 

 signed to Venezuela to do paleontological work 

 for the Lago Petroleum Corporation. In 1941 

 he was transferred to The Carter Oil Company 

 to initiate paleontological work at Shreveport, 

 Louisiana. At the end of 1946 he was trans- 

 ferred to the newly organized geological re- 

 search section of The Carter Oil Company with 

 headquarters in Tulsa, Oklahoma. His present 

 title is Senior Research Geologist, in charge 

 of the microfossil group of the Jersey Pro- 

 duction Research Company. 



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