Mac Barnett Mac Barnett is the author of several picture books, including Chloe and the Lion and Guess Again!, which TIME Magazine named the no. 2 Picture Book of 2010. He also writes the Brixton Brothers series of mysteries. Mac is the founder of he Echo Park Time Travel Mart, a convenience store for time travellers, and serves on the board of 826LA, a not-for-profit writing and tutoring centre in LA. His collaborations with Jon Klassen, Extra Yarn and Sam & Dave Dig a Hole, have both won the Caldecott Honor. He lives in California, USA. Read More Read Less