Sally M. Walker is the award-winning author of more than sixty books for children, including the companion book Earth Verse: Haiku from the Ground Up, illustrated by William Grill. She is also the author of Sinking the Sultana A Civil War Story of Imprisonment, Greed, and a Doomed Journey Home and Champion: The Comeback Tale of the American Chestnut Tree, an Orbis Pictus Honor Book. She says that researching and writing Boundaries: How the Mason-Dixon Line Settled a Family Feud and Divided a Nation led her to the amazing world of stars and outer space. Sally M. Walker lives in Illinois.