Columbus Marion "Dad" Joiner (1860 - 1947), a Texan oil wildcatter, discovered in 1930 the East Texas oilfield, then the largest in the world. Joiner ran a law practice in Tennessee and was a member of the state's legislature from 1889 to 1891. He moved to Oklahoma in 1897, where he made and lost two fortunes in oil before moving to Texas in 1926. Despite the contrary opinion of geologists, Joiner was convinced of the possibility of oil deposits in east Texas. His first two wells were unsuccessful, forcing his associates and himself further into debt. Fortunately, the third well, Daisy Bradford No. 3, began producing oil on October 3, 1930. At the time, this single field contained a significant fraction of the nations proved reserves of oil. East Texas was one of a number of large fields discovered in the 1920s and 1930s, which later proved to be the peak period of oil discovery in the lower 48 states.