Christopher Grabenstein is an American author. He published his first novel in 2005, and since then, he has written novels for both adults and children, often collaborating with James Patterson. Grabenstein is a #1 New York Times bestselling author. His books include the LEMONCELLO, WONDERLAND, HAUNTED MYSTERY, DOG SQUAD, and SMARTEST KID IN THE UNIVERSE series. He graduated from the University of Tennessee in 1977 with a degree from the College of Communication and Information. In the 1980s, he performed with the improvisational group "First Amendment Comedy."