George Ella Lyon is the author of Trucks Roll!, Planes Fly!, and Boats Float!, cowritten with her son Benn. Among George Ella’s other books are the ALA Notable All the Water in the World and What Forest Knows. A novelist and poet, she lives with her family in Lexington, Kentucky. Visit her online at GeorgeEllaLyon.com.

Stephen Gammell is the beloved illustrator of more than fifty books for children, including Song and Dance Man by Karen Ackerman, which received the Caldecott Medal, and two Caldecott Honor Books: The Relatives Came by Cynthia Rylant, Where the Buffaloes Begin by Olaf Baker, and The Secret Science Project That Almost Ate Our School by Judy Sierra. Mr. Gammell lives with his wife, Linda, in St. Paul, Minnesota.