Katherine Applegate is the author of The One and Only Ivan, winner of the 2013 Newbery Medal. Her novel Crenshaw spent over twenty weeks on the New York Times children's bestseller list, and her first middle grade standalone novel, the award-winning Home of the Brave, continues to be included on state reading lists, summer reading lists, and class reading lists.

She lives with her husband, the author Michael Grant, who she co-wrote the Animorphs series with, and their two children in Northern California.

Charles Santoso has illustrated many books, including Dandy by Ame Dyckman, I Don't Like Koala! by Sean Ferrell, the New York Times bestseller Wishtree by Katherine Applegate, and Ida, Always by Caron Levis. He moves between different countries to live and work but calls Sydney, Australia home.