Glenn was born in Wimberly on February 2, 1942. He started rodeoing in high school in 1954, winning many awards. His first money was in Burnet in the bull riding to start a long and successful career.
He joined the PRCA in 1964, ending the year as runner-up Rookie of the Year, competing in the bull riding and bareback riding. In the Southwestern Rodeo Association, he finished 1972 in second place for the All-Around title, claimed the Champion Bull Riding Title and finished in the Top 10 in the bareback riding. He continued to compete in rodeos until 1982. He managed the Gulf Plains Rodeo Company and the Texas Rodeo Company, producing many rodeos.