Who was born in 1899 and wrote the book series "Mary Poppins"?
Mary Poppins (film):  The screenplay is by Bill Walsh and Don DaGradi, loosely based on P. L. Travers' book series "Mary Poppins". P. L. Travers: Pamela Lyndon Travers, OBE ( ; born Helen Lyndon Goff; 9 August 1899 – 23 April 1996) was an Australian-born writer who spent most of her career in England.
P. L. Travers