Todd Tarpley is a picture-book author whose titles include Beep! Beep! Go to Sleep!, Ten Tiny Toes, Three Grumpy Trucks, and How to Become a Knight (in Ten Easy Lessons). He lives with his two sons in New York.

John Rocco is the illustrator of How to Train a Train by Jason Carter Eaton and The Flint Heart by Katherine and John Paterson.

John Rocco's picture book Blackout received a Caldecott Honor. He is also the jacket artist for Rick Riordan's best-selling Percy Jackson and the Olympians series and has collaborated with Whoopi Goldberg on the picture book Alice.

Previously a creative director at Walt Disney Imagineering and preproduction director for the film Shrek at DreamWorks, John Rocco lives in Los Angeles.