HARRIET ZIEFERT is a former elementary school teacher from North Bergen, New Jersey. A graduate of Smith College, she also holds an MA in Education from NYU. She is the bestselling author of more than 250 children's books and has developed easy-to-read series for several major publishing houses. As founder of Blue Apple Books, she has published over 500 titles, many of which have become best-selling modern classics. Harriet Ziefert continues to create and publish books from her home, where she now lives, in Great Barrington, Massachusetts.

TRAVIS FOSTER, a graduate of the Ringling College of Art and Design in Sarasota, Florida, has been illustrating for more than 25 years. Kirkus Reviews praised his work in What's New at the Zoo? as "ingenious illustrations [that] feature antic cartoonish animals in an explosion of colors ...." His editorial and advertising clients include Target, Disney, Forbes, Internet Week, Aetna, The Wall Street Journal, and The Washington Post. Foster lives in Nashville, Tennessee, with his wife and four children.