Mac Barnett is the author of the Brixton Brother series and several picture books, including Guess Again! and Chloe and the Lion (both illustrated by Adam Rex), and the New York Times bestseller Extra Yarn. He’s on the board of directors of 826LA, a nonprofit writing center, and founded the Echo Park Time Travel Mart, a convenience store for time travelers. Mac lives in Oakland, California.

Marla Frazee is the recipient of a Boston Globe–Horn Book Award for Picture Book and a three-time Caldecott Honor winner. She has illustrated many acclaimed picture books, including All the World by Liz Garton Scanlon, Stars by Mary Lyn Ray, and Everywhere Babies by Susan Meyers, as well as her own Farmer Books trilogy, A Couple of Boys Have the Best Week Ever, and The Boss Baby, which inspired the DreamWorks Animation film. She is also the illustrator of the New York Times bestselling Clementine chapter books by Sara Pennypacker. The mother of three grown sons, she lives in Pasadena, California. Visit her at [...].