John F. Cullen (b. 1889) graduated from Stanford University in 1913 with a degree in electrical engineering. He began his career in the oil business as an electrician in southern California oil fields in 1916. From 1916-1920, he was involved with the construction of Midwest Refining Company plants at Salt Creek, Elk Basin, and Laramie, Wyoming. He later became a vice president of Standard Oil Company. He was at the Standard Oil Company refinery in Casper when these diaries were written.
From the description of Diaries, 1938-1948. (University of Wyoming, American Heritage Center). WorldCat record id: 27423886