Ruth Plumly ThompsonRuth Plumly Thompson (27 July 1891 - 6 April 1976) was a children's author. Born in Philadelphia, Pennsylvania, she sold her first story to St. Nicholas Magazine, a monthly children's magazine, while still in high school. After publishing her first bok, The Perhappsy Chaps, she was asked to continue the Oz series following L. Frank Baum's death. Beginning in 1921, she wrote one Oz book a year through 1939; after writing two more in 1972 and 1976, she had contributed 21 new Oz books to the series. Read More Read Less