Robie H. Harris (1940-2024) is the New York Times best-selling author of the acclaimed Family Library series—It’s Perfectly Normal, It’s So Amazing!, and It’s Not the Stork!—illustrated by Michael Emberley; CRASH! BOOM! A Math Tale, illustrated by Chris Chatterton; and Somewhere, illustrated by Armando Mariño. She is also the author of the Let’s Talk About You and Me series, illustrated by Nadine Bernard Westcott, and many other books for young children.

Michael Emberley says that while creating the illustrations for IT'S SO AMAZING!, he "tried to delicately balance age-appropriateness, absolute accuracy, honesty, and just plain fun."