Judith Viorst was born and brought up in New Jersey and now lives in Washington, DC. Her books include the beloved Alexander and the Terrible, Horrible, No Good, Very Bad Day, and its many companion books; adult fiction and nonfiction including the New York Times bestseller, Necessary Losses; poetry for children and adults, and four musicals.

Her most recent book of poetry for children, What Are You Glad About? What Are You Mad About? was published in 2016. Lulu Is Getting a Sister is the fourth book in the Lulu series.

Lee White is the illustrator of many books for children, including I Lived on Butterfly Hillaby Marjorie AgosYn, winner of the Pura BelprU Award; The Lost Track of Timeaby Paige Britt; Arctic Whiteaby Danna Smith; and, most recently, Emma and the Whale by Julie Case. He lives with his wife and son in Portland, Oregon, where the wind makes his umbrella useless when it rains.