Bart King taught middle school for many years. He's written 28 books, including The Big Book of Girl Stuff, The Big Book of Boy Stuff, The Big Book of Superheroes, The Big Book of Gross Stuff, and Bart's King-Sized Book of Fun. Bart's Gibbs Smith titles have sold more than 830,000 copies combined. He resides in Portland, Oregon.

Greg Paprocki works full-time as an illustrator and book designer. He has illustrated several Curious George books, as well as previous books in the Little Leonardo series, the BabyLit Alphabet book series, and The Big Book of Superheroes for Gibbs Smith. His Gibbs Smith titles have sold over 130,000 copies. Greg resides in Lincoln, Nebraska.