Born in Shelbyville, Bedford County, Tennessee, Thomason moved to Gainesville, Texas, with his parents in 1880.

[1] He attended public schools, and received a Bachelor of Science degree from Southwestern University in Georgetown, Texas, in 1898.

[1] Thomason served as the Mayor of El Paso from 1927 to 1930, and was elected to the 72nd United States Congress as a Democrat in 1930.

[1][2] El Paso County Hospital District's University Medical Center, was named in his honor from 1963 until 2009.

This article incorporates public domain material from the Biographical Directory of the United States Congress