Danica McKellar is the New York Times bestselling author of groundbreaking math books, including Do Not Open This Math Book, picture books Goodnight, Numbers, Ten Magic Butterflies, and Double Puppy Trouble, and the middle school hit Math Doesn't Suck. She is a summa cum laude graduate of UCLA with a degree in mathematics and has published an original theorem in the prestigious Journal of Physics now known as the Chayes-McKellar-Winn theorem. She is the recipient of mathematics and educational awards, including the Communication Award from the Joint Policy Board for Mathematics, and UCLA's Science and Education Pioneer Award in 2018. She testified before Congress about encouraging women to excel in mathematics, and was even named Person of the Week by ABC News for her unique and valuable work as a math education author. Danica is also well known for her acting roles on The Wonder Years, The West Wing, multiple Hallmark Channel movies, and more. Visit McKellarMath.com to see the ever-growing line of Danica's helpful, fun math books!

Josée Masse is the illustrator of the bestselling The Care and Keeping of You, and a recognized artist in her native Canada, having illustrated numerous French and American picture books. She began her career as a graphic designer. Josée lives and works outside Montreal.