is the author of more than 20 children's books including the Science Makes it Work picture book series and the Kirkus star-reviewed A Dog's Day chapter book series. She holds a master’s degree in reading and literacy and has served as a magazine writer, newspaper columnist, and writing instructor. Stier resides in San Antonio, Texas.
Francesca Rosa was born in Italy and is a graduate of the School of Comics in Milan. She spent two years working as a fashion graphic designer before becoming a full-time illustrator. Now she works in her studio in Milan with her husband Lorenzo.