In 1911, Gonzaullas was appointed a major in the Mexican Army, and in 1915 he became a special agent in the United States Treasury Department.
[1] When in January 1933, Miriam Amanda "Ma" Ferguson took office after being elected governor, she proceeded to discharge all serving Rangers, including Gonzaullas.
Gonzaullas was appointed superintendent of the Bureau, and he played a major role in turning it into one of the best crime laboratories in the United States.
His work was commended by his superiors and was instrumental in re-establishing the status of the agency after the instability it had gone through in the previous decades.
He died of cancer at the age of 85 while living in Dallas, Texas, on February 13, 1977, and was buried in Sparkman/Hillcrest Memorial Park in the same city.