 Waller was a private secretary to United States Representative Pat Harrison in 1911.He was in private practice in Bay St. Louis, Mississippi from 1914 to 1927, and was a United States Army lieutenant colonel in World War I. Waller served as a member of the Mississippi House of Representatives in 1924.Waller relocated to Florida and was in private practice in Tallahassee from 1930 to 1940.