Mac Barnett is the New York Times bestselling author of many picture books, including Extra Yarn and Sam & Dave Dig a Hole, both illustrated by Jon Klassen and both Caldecott Honor award winners. He is also the author of the bestselling Terrible Two series with Jory John. Mac lives in Berkeley, California. You can visit him online at www.macbarnett.com. Renata Liwska grew up in Warsaw, Poland, and now lives in Calgary, Alberta. She is the illustrator of The Quiet Book and The Loud Book!, both written by Deborah Underwood and both New York Times bestsellers. For The Quiet Book, Renata Liwska was awarded the 2010 Society of Illustrators Gold Medal and was named a 2010 Governor General's Literary Award finalist. Visit her online at www.renataliwska.com.