[2] Born in Oakland, California, Foster and her family moved to Berkeley after her parents opened a weaving studio, where she spent most of her childhood.
[2] After some time working with Dalgliesh, Foster left to become a freelance editor at Knopf while raising her two children.
[3] During her time working for Knopf, Foster served as the editor of several notable authors, such as Leo Lionni and Roald Dahl.
[5] The imprint would publish around a dozen new children's books every year,[1] with titles by authors such as Peter Sís and Louis Sachar.
[1] Foster was cousin to writer and poet Elizabeth Coatsworth, and her grandmother's brother was Elbert Hubbard, an artist who founded the Roycroft Press.