After Baum's death in 1919, the company Reilly & Lee were interested in continuing the Oz stories. Ruth Plumly Thompson was chosen and she wrote an Oz book a year, starting in 1921. Thompson didn't have the word play that Baum did, but she did choose to bring a new kid from America each time to visit Oz in every story. She resigned writing Oz stories in 1939 and the illustrator for her stories, John R. Neill, took over.

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Her house still stands in Philadelphia with a plaque outside commemorating the spot. 

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This is a private residence. Please do not trespass.