Judith Viorst was born and brought up in New Jersey, graduated from Rutgers University, moved to Greenwich Village, and has lived in Washington, DC, since 1960, when she married Milton Viorst, a political writer. They have three sons and seven grandchildren. A graduate in 1981 of the Washington Psychoanalytic Institute, Viorst writes in many different areas: science books, children’s chapter and picture books—including the beloved Alexander and the Terrible, Horrible, No Good, Very Bad Day, which has sold some four million copies—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 adults, Wait For Me and Other Poems About the Irritations and Consolations of a Long Marriage, was published by Simon & Schuster in 2015. Her most recent book of poetry for children, What Are You Glad About? What Are You Mad About? was published in 2016 by Atheneum/Caitlyn Dlouhy Books.
Hilary Knight, son of artist-writers Clayton Knight and Katharine Sturges, was educated at the Art Students League, where he studied with Reginald Marsh. Besides the Eloise books, Hilary Knight has illustrated more than fifty books for children, six of which he wrote himself. He lives and works in New York City, not far from The Plaza Hotel.