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Mac Barnett is the author of several picture books, including President Taft Is Stuck in the Bath, Chloe and the Lion, and Guess Again!, which TIME magazine named the number 2 Picture Book of 2010.

Mac Barnett collaborated with Jon Klassen on Extra Yarn, which won the 2012 Boston Globe–Horn Book Award in the Picture Book category, and on Sam and Dave Dig a Hole.

Mac Barnett also writes the Brixton Brothers series of mysteries. He is the founder of the Echo Park Time Travel Mart, a convenience store for time travelers, and serves on the board of 826LA, a not-for-profit writing and tutoring center in Los Angeles. He lives in California.

Jon Klassen is the creator of the #1 New York Times bestseller I Want My Hat Back, which was named a Theodor Seuss Geisel Honor Book, a New York Times Book Review Best Illustrated Children’s Book of the Year, and a Publishers Weekly Best Children’s Book of the Year. He returned with another hat and another thief in This Is Not My Hat, which won the Caldecott Medal became a New York Times bestseller.

He is also the illustrator of House Held Up By Trees, a picture book written by Pulitzer Prize–winning poet Ted Kooser, as well as Cats’ Night Out by Caroline Stutson, which won the Governor General’s Award; Extra Yarn and Sam and Dave Dig a Hole by Mac Barnett; and the Incorrigible Children of Ashton Place series by Maryrose Wood.

Jon Klassen has worked as an illustrator for feature animated films, music videos, and editorial pieces. His animation projects include design work for DreamWorks Feature Animation as well as LAIKA Studios on their feature film Coraline. Other work includes designs for a BBC spot used in the coverage of the 2010 Olympics in Vancouver, which won a 2010 BAFTA award. Originally from Niagara Falls, Ontario, Jon Klassen now lives in Los Angeles.