Stephen M. Tomecek began his professional career as a geologist (yes, he's a real scientist!). He served as the Associate Director for the Science Museum of Long Island and as the Science Program Supervisor for the New York Hall of Science. He has written and has helped to develop websites for Discovery Communications, the Johns Hopkins School of Public Health and Los Alamos Labs. Steve has written over 45 nonfiction books for both teachers and kids. He lives in New York City, USA. Marcos Farina is an Argentine graphic designer & illustrator. He has a bachelor's degree in graphic design from the University of Buenos Aires. He is professor at the Faculty of Architecture, Design and Urbanism of the Buenos Aires University, where he has taught since 2005.