DeGolyer and MacNaughton is a petroleum consulting company based in Dallas, Texas, with offices in Houston, Moscow, Astana, Buenos Aires, and Algiers.

DeGolyer originally guaranteed a minimum salary of $350 a month to McNaughton with the possibility of greater remuneration if business developed.

"[4][2] Though appraising to obtain financing was one of its early tasks, the firm also performed general geological surveys, studies of oilfield development, and even the evaluation of problems with management.

It served as a consultant for companies in Mexico, Peru, Uruguay, Brazil, Ecuador, Columbia, Venezuela and Trinidad, and would later work with the United States Government to evaluate oil in Alaska and the critical Middle East.

[5] The firm portrays itself as having extensive experience in all the oil producing regions in the world and has divisions in: DeGolyer and MacNaughton Corp. provides petroleum consulting services in the United States and internationally.