Under Cullinan's leadership, Texaco grew rapidly into one of the most recognizable petroleum brands in the United States. By the 1920s, the company operated thousands of service stations nationwide, helping standardize branded gasoline marketing and consumer trust at a time when fuel quality varied widely.
Cullinan was also an early advocate of international expansion. Texaco became one of the first U.S. oil companies to operate extensively in Latin America and Europe, setting a model for global oil integration that major energy companies still follow today. His legacy lives on in the vertically integrated structure that defines modern oil majors.
