 His book "Seeds and Planting in the South"
 is regarded as a standard text-book for many agricultural colleges.In September 2003, Pennington was entered posthumously into the Georgia Agricultural Hall of Fame.Pennington served as a member of the Georgia House of Representatives and was elected to the Georgia State Senate, serving for eight years as Chairman of the Georgia Senate Agriculture and Natural Resources Committee, as well as holding positions on a number of other committees.