Gregory E. Lang is the New York Times bestselling author of more than 20 books, including Why a Daughter Needs a Dad, Why a Daughter Needs a Mom, Why a Son Needs a Dad, Why a Son Needs a Mom, and Why I Love You. He lives in Georgia. Susanna Leonard Hill is the New York Times bestselling author of Moon's First Friends, as well as many other award-winning books for children. She does frequent school and library visits, teaches picture book writing, and offers picture book critiques. She lives in New York's Mid-Hudson Valley with her children and two rescue dogs. Gail Yerrill lives in a village in Bedfordshire, England. After gaining her BA (Hons) in 2D design in 1998 she became a freelance illustrator and designer of greetings cards and giftwrap for a major British supermarket chain, and has also illustrated items for other significant British institutions.

She has illustrated many books for well known publishers, several of which are translated into many languages. Gail is well known for her soft, whimsical style which is well loved by children and adults alike.