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. When she's not writing, Carolyn enjoys traveling, hiking, reading, and playing games. She lives in Plympton, Massachusetts, with her husband and two cats, Napi and Emilio.

Internationally known artist Michael W. Carroll has been painting astronomical subjects for over twenty years. He helped to found the International Association for the Astronomical Arts (IAAA) in 1984, and 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, including works by Carl Sagan, Arthur C. Clarke, David Brin, and Terence Dickenson. One of his paintings was flown aboard Russia's MIR space station in 1995. Mike is also a science journalist, with articles appearing in Popular Science, Astronomy, Sky & Telescope, Artists, and Earth magazines. He lives with his wife and kids at the foot of the Rockies in Littleton, Colorado.