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From 1919 to 1920, Williams worked as an engineer for the Oil Belt Power Company in Eastland, located east of [[Abilene]], Texas. For four years, he was a surveyor and an engineer for the Texas and New Mexico state highway departments. In 1924, he became the chief engineer for the Texon Oil and Land Company, in which position he developed an interest in geology though he had no formal training in the field. He became one of the earliest licensed geologists in Texas,<ref name=handbook/> having taken the lead in the discovery of the Settles and Harding oilfields in Howard County near Big Spring, and the first discovery well in the Ellenburger field. Upon Williams’ recommendation, Texon in 1926 drilled the deepest well in the United States until that time, the University 1-B well.<ref>{{cite web|url=http://blogs.chron.com/txpotomac/2008/12/today_in_texas_history_carl_g.html|title=Today in Texas History: Carl G. Cromwell drills world's deepest oil well| publisher=blogs.chron.com|accessdate=December 2008; no longer on-line}}</ref> In 1927, Williams established a water and ice works plant in Crane, south of [[Odessa, Texas|Odessa]], which he operated until 1935, having by that time resigned from Texon.<ref name=handbook/>​

From 1919 to 1920, Williams worked as an engineer for the Oil Belt Power Company in Eastland, located east of [[Abilene]], Texas. For four years, he was a surveyor and an engineer for the Texas and New Mexico state highway departments. In 1924, he became the chief engineer for the Texon Oil and Land Company, in which position he developed an interest in geology though he had no formal training in the field. He became one of the earliest licensed geologists in Texas,<ref name=handbook/> having taken the lead in the discovery of the Settles and Harding oilfields in Howard County near Big Spring, and the first discovery well in the Ellenburger field. Upon Williams’ recommendation, Texon in 1926 drilled the deepest well in the United States until that time, the University 1-B well.<ref>{{cite web|url=http://blogs.chron.com/txpotomac/2008/12/today_in_texas_history_carl_g.html|title=Today in Texas History: Carl G. Cromwell drills world's deepest oil well| publisher=blogs.chron.com|accessdate=December 2008; no longer on-line}}</ref> In 1927, Williams established a water and ice works plant in Crane, south of [[Odessa, Texas|Odessa]], which he operated until 1935, having by that time resigned from Texon.<ref name=handbook/>​

 

In the late 1920s, Williams enrolled for a year of law school at the [[University of Texas at Austin]]<ref name=c31>''Claytie'', p. 31</ref> but returned to his independent oil and ranching business.<ref name=handbook/>​

In the late 1920s, Williams enrolled for a year of law school at the [[University of Texas at Austin]]<ref name=c31>''Claytie'', p. 31</ref> but returned to his independent oil and ranching business.<ref name=handbook/>​