Theodore Gray is the author of The Elements: A Visual Exploration of Every Known Atom in the Universe; Theo Gray's Mad Science: Experiments You Can Do At Home, But Probably Shouldn't; Mad Science 2: Experiments You Can Do At Home, But Still Probably Shouldn't; and Popular Science magazine's 'Gray Matter' column. With his company Touch Press, Gray is the developer of best-selling iPad and iPhone apps, including The Elements, Solar System, Disney Animated, The Orchestra, The Waste Land, and Skulls by Simon Winchester. He lives in Urbana, Illinois.Theodore Gray is the author of the bestselling book The Elements: A Visual Exploration of Every Known Atom in the Universe and Theo Gray's Mad Science: Experiments You Can Do At Home, But Probably Shouldn't. He is the author of Popular Science magazine's monthly column, 'Gray Matter' and the proprietor of periodictable.com. He is also cofounder of Touch Press, an ebook company that is defining the future of publishing, and the cofounder of Wolfram Research, creators of the world's leading technical software system, Mathematica© and Wolfram ? AlphaT. He lives in Champaign-Urbana, Illinois.
Anja Grebe teaches art history at the University of Erlangen- Nuremberg/Germany. She is taking part in numerous international research projects and exhibitions and has published extensively on medieval and modern art history. Grebe is the author of The Louvre: All the Paintings and The Vatican: All the Paintings. She lives in Erlangen, Germany.