G.K. Lewallen’s rodeo career spanned a twenty-year period from 1937 until 1956. He still holds cards for the P.R.C.A and the Cowboy Turtles Association. Looking back, Lewallen said that his most outstanding rodeo was in 1945 when he won the bull riding event and placed in the bronc riding at Madison Square Garden. Some other rodeos he won were Albuquerque, Fort Worth, Rapid City, Ogden, Billings, Woodward, and Burwell. Some of the rodeos where he won all three riding events the same year were Coleman, TX., Chanute, KA, and Killeen, TX.
In 1956, Lewallen opened the Grand Entry Western Store in Stephenville. In 1977, he was among the first bank directors to charter the Town & Country Bank in Stephenville, and he continues to serve on the Board of Directors. Lewallen served on the executive committee for the Texas P.R.C.A. Rodeo Circuit Board of Directors for many years. He also served as President for the Rodeo Historical Society of the Cowboy Hall of Fame at Oklahoma City. Lewallen has also served on the Board of Directors of the Erath County Livestock Assn. and has been an active member of the Chamber of Commerce and Erath County Junior Livestock Show.
Tarleton State University has honored Lewallen with numerous plaques of appreciation for his support with the Tarleton Rodeo Assn. and Agricultural Dept. In 1994, G.K. Lewallen was inducted into the Rodeo Hall of Fame, an extension of the Cowboy Hall of Fame in Oklahoma City, OK.