Sally M Walker

Sally M. Walker majored in geology and is the author of Sibert Medal winner Secrets of a Civil War Submarine as well as many other nonfiction books, including Boundaries: How the Mason-Dixon Line Settled a Family Feud and Divided a Nation and Winnie: The True Story of the Bear Who Inspired Winnie-the-Pooh. Sally M. Walker lives in Illinois.

William Grill is the author-illustrator of Shackleton's Journey, a New York Times Best Illustrated Children's Book of the Year and winner of a Kate Greenaway Medal, and The Wolves of Currumpaw. He lives in England.