American author who is best known for her popular young adult fiction series, The Baby-Sitters Club. Her other works for children and young adults include Bummer Summer (1983) and Missing Since Monday (1986).
Her 2002 stand-alone novel, A Corner of the Universe, received the prestigious Newbery Medal for children's literature in 2003.
She and her sister, Jane, grew up in Princeton, New Jersey. In her adulthood, she lived first in New York City, and then in New York state's Hudson Valley.
She graduated from Smith College and worked as a teacher and editor before becoming a full-time writer. She published the first book in her popular Baby-Sitters Club series in 1986.