Susan Lendroth is the author of
Natsumi!;
Old Manhattan Has Some Farms, and
Hey-Ho, to Mars We'll Go!, which was read aboard the International Space Station. She works with books and librarians at the Los Angeles Public Library.
Bob Kolar is the author and illustrator of many books for children, including
Hey-Ho, to Mars We'll Go!; Stomp! Stomp!; and the Astroblast! series, the basis for the Sprout TV show. He is also the illustrator of
The Boy and the Book;
Slickety Quick; and The Little Vehicles series. When he's not writing and illustrating books, Bob teaches art at the Kansas City Art Institute.