CHRIS GRABENSTEIN is the New York Times bestselling author of Escape from Mr. Lemoncello's Library, Mr. Lemoncello's Library Olympics, Mr. Lemoncello's Great Library Race, The Island of Dr. Libris, and the Welcome to Wonderland series, as well as the coauthor of numerous page-turners with James Patterson, including Word of Mouse, Max Einstein: The Genius Experiment, and the I Funny, House of Robots, and Treasure Hunters series. Chris lives in New York City. Visit Chris at ChrisGrabenstein.com and on Twitter at @CGrabenstein.

Leo Espinosa is a New York Times bestselling illustrator and designer from Bogotá, Colombia. His work has been featured in a variety of publications, products, animated series and gallery shows worldwide. His short list includes The New Yorker, Wired, Esquire, The New York Times, The Atlantic, Nickelodeon, Hasbro, American Greetings, and Facebook. Leo's award-winning illustrations have been recognized by American Illustration, Communication Arts, Pictoplasma, 3x3, and the Society of Illustrators. In addition, he has given multiple lectures and workshops at schools and institutions such as Parsons School of Design and Pratt Institute as well as serving on the faculty of the Rhode Island School of Design.
He lives with his family in Salt Lake City, Utah. Visit him at studioespinosa.com or follow him on Twitter @veloespinosa.