Judith Viorst is the author of the beloved Alexander and the Terrible, Horrible, No Good, Very Bad Day, which has sold some four million copies; the Lulu books, including Lulu and the Brontosaurus; the New York Times bestseller Necessary Losses; four musicals; and poetry for children and adults. Her most recent books of poetry include What Are You Glad About? What Are You Mad About? and Nearing Ninety. She lives in Washington, DC.

Diana Cain Bluthenthal is the author and illustrator of Matilda the Moocher and I'm Not Invited?, and the illustrator of a dozen other books for children. She lives with her husband. two young sons, and pets (including two worms) in North Carolina.