Matthew J. Kirby is the critically acclaimed and award-winning author of the middle grade novels The Clockwork Three, Icefall, The Lost Kingdom, Infinity Ring Book 5: Cave of Wonders, and The Quantum League series, the Dark Gravity Sequence, and the Assassin's Creed series, Last Descendants. He was named a Publishers Weekly Flying Start, he has won the Edgar Award for Best Juvenile Mystery, the PEN Center USA award for Children's Literature, and the Judy Lopez Memorial Award, and has been named to the New York Public Library's 100 Books for Reading and Sharing, and the ALA Best Fiction for Young Adults lists. He is also a school psychologist, and currently lives in Utah with his wife and three step-kids.