David A. Adler is a former math teacher and author of more than two hundred books for children. He has collaborated on several science picture books with Anna Raff, including
Light Waves and
Magnets Push, Magnets Pull, both named finalists for the AAAS/Subaru SB&F Prize for Excellence in Science Books. He is also the author of the Picture Book Biography series and the Cam Jansen mystery series. He lives in New York.
Rob Shepperson's editorial illustrations have appeared in
The New York Times, The Washington Post, and
The Wall Street Journal. The children's books he has illustrated include
Thunderboom! by David L. Harrison and
Blue Daisy by Helen Frost. He lives on the Hudson River, along Zimmy's route, in Croton-on-Hudson.