Walker is an American writer of nonfiction for children.
She is best known for writing about scientific subject matter such as Fossil Fish Found Alive: Discovering the Coelacanth (2005) or Written in Bone: Buried Lives of Jamestown and Colonial Maryland (2009).
Additionally Walker is known for books written in both Spanish and English (bilingual books) as seen in La Luz/Light (2007) and La Electricidad/Electricity (2007).
She is also known as Sally Fleming, Sally MacArt Walker, and Sally Macart Walker.