MARY POPE OSBORNE is the author of the New York Times #1 bestselling Magic Tree House series as well as coauthor of the Magic Tree House Fact Tracker series, along with her husband, Will; her sister, Natalie Pope Boyce; and her good friend Jenny Laird.

AG FORD is a New York Times bestselling children's book illustrator and recipient of two NAACP Image Awards. He grew up in Dallas with his mom, his dad, and his two sisters and one brother. He majored in illustration at Columbus College of Art & Design and now lives with his family in Frisco, Texas. Visit him at agfordillustration.com.