Gregory Maguire is the author of the incredibly popular books in the Wicked Years series, including Wicked: The Life and Times of the Wicked Witch of the West, which inspired the musical. He is also the author of several books for children, including What-the-Dickens, a New York Times bestseller, and Egg & Spoon, a New York Times Book Review Notable Children's Book of the Year. Gregory Maguire lives outside Boston.

David Litchfield started to draw when he was very young, creating comics for his older brother and sister. Since then his work has appeared in magazines, newspapers, and books and on T-shirts. His first picture book, The Bear and the Piano, won the Waterstones Children's Book Prize. He is also the illustrator of Rain Before Rainbows by Smriti Prasadam-Halls and War Is Over by David Almond. David Litchfield lives in England.