Wendy Pfeffer enjoyed early careers as a teacher and a nursery school director. She now devotes her time to writing and conducting workshops on creative writing for both adults and children. She is the author of the Let's-Read-and-Find-Out Science book Sounds All Around as well as The Gooney War and Popcorn Park Zoo. Ms. Pfeffer lives in Pennington, New Jersey.

Holly Keller has illustrated a number of books in the Lets-Read-and-Find-Out Science series, including Be a Friend to Trees. She is also the author and illustrator of many picture books, including Island Baby and Horace.

Ms. Keller lives in West Redding, Connecticut.