Leonard was born on June 29, 1917 to James Earl and Rose Etta Waggoner in Clyde, Texas. He graduated from Abilene Christian University. He was in the armed forces and served in WWII and the Korean War. He was stationed in England during WWII as a Chaplin and during the Korean War he was a Chaplain at Fort Hood. Leonard married Elizabeth Wilson in 1944. He was a renowned Church of Christ minister throughout the state of Texas. He was a member of Bell Avenue Church of Christ. He was instrumental in forming the Houston Christian Home for the Aged.He is preceded in death by his wife, and parents and five brothers.Survivors include daughter, Rosalyn Boatman and husband Joe of Boulder, Colorado; two sons, Don R Waggoner and wife Frances, of Houston and Jon R Waggoner of Dallas; brother, Carroll Waggoner and wife, Daisy of College Station, Texas; seven grandchildren; five great-grandchildren, and two great- great-grandchildren.