Carolyn Cinami DeCristofano is the author of Leonardo's ABC's, as well as the acclaimed nonfiction middle grade read, A Black Hole Is Not a Hole. Aside from writing for children, Carolyn is also science educator and principal consultant with Blue Heron STEM Education. She has developed science programs with NASA and the Harvard-Smithsonian Center for Astrophysics. Carolyn lives in Boston, Massachusetts.

Internationally known artist Michael W. Carroll has been painting astronomical subjects for over 20 years. His art has appeared in several hundred magazines throughout the world, including Time, Smithsonian, National Geographic, and Astronomy. His paintings have aired on NOVA, COSMOS, and various TV specials, and have embellished albums and numerous books. Michael lives at the foot of the Rockies in Littleton, Colorado. - (Random House, Inc.)