Julie Fogliano is an author of bestselling children's books, including A House That Once Was, illustrated by Lane Smith, When Green Becomes Tomatoes, illustrated by Julie Morstad, and And Then It's Spring and If You Want to See a Whale, both illustrated by Erin E. Stead. She lives in the Hudson Valley in New York.

Christian Robinson is an acclaimed creator of You Matter and Another. He's the illustrator of numerous children's books, including Gaston by Kelly di Puchhio and the New York Times bestseller Last Stop on Market Street by Matt de la Peña, which won the Newbery Medal as well as a Caldecott Honor. He also illustrated School's First Day of School by Adam Rex, recipient of seven starred reviews and a New York Times Bestseller. His wordless picture book Another was named a New York Times / NYPL Best Illustrated Children's Book. His previous collaboration with Julie Fogliano, When's My Birthday? received five starred reviews and was named a 2018 Boston Globe-Horn Book Honor Book.