William M. Koch is a long-time resident of 

 Houston, and received his B.S. degree in 

 mechanical engineering from the Rice In- 

 stitute in 1942. He started his professional 

 career with the Douglas Aircraft Company. 

 After an interruption for Army service, he 

 joined the Reed Roller Bit Company in 1947. 

 In 1953, he received an M.S. degree from the 

 Rice Institute under a company-sponsored 

 program, and at present is a member of the 

 Engineering Research Department. 



A. I. Levorsen, a native of Minnesota, re- 

 ceived the Engineer of Mines degree from 

 the University of Minnesota in 1917. He 

 received the Doctor of Engineering degree 

 (honorary) from the Colorado School of 

 Mines and the D.Sc. degree (honorary) from 

 the University of Minnesota. He was a geol- 

 ogist with various oil companies until 1935 

 and a consulting geologist from 1931 to 1934, 

 1935 to 1945, and 1951 to date. He was Pro- 

 fessor of Geology and Dean of the School of 

 Mineral Sciences at Stanford University from 

 1945 to 1951. He is a past president of the 

 Geological Society of America, and of the 

 American Association of Petroleum Geologists. 

 He is the author of numerous papers and the book, Geology of Petroleum, 

 published in 1954. He has had geological experience in several foreign countries, 

 including Canada, Pakistan, Brazil, France, and North Africa. 



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