Sarah Chauncey Woolsey (January 29, 1835 – April 9, 1905) was an American children's author who wrote under the pen name Susan Coolidge. Woolsey worked as a nurse during the American Civil War (1861–1865), after which she started to write. She never married, and resided at her family home in Newport, Rhode Island, until her death. She edited The Autobiography and Correspondence of Mrs. Delaney (1879) and The Diary and Letters of Frances Burney (1880). She is best-known for her classic children's novel What Katy Did (1872). The fictional Carr family was modeled after her own, with Katy Carr inspired by Woolsey herself. The brothers and sisters were modeled on her four younger siblings.
