Theodore Gray is the author of The Elements, Molecules, and Reactions, as well as Theodore Gray's Completely Mad Science and How Things Work. He is the creator of the bestselling iPad apps "Elements" and "Molecules," which have both been named "App of the Week" by Apple and was Director of "Disney Animated" (also honored by Apple as "iPad App of the Year"). Gray appeared on stage with Steve Jobs several times in his capacity as a software creator. He also co-founded Wolfram Research, Inc., makers of the widely used software Mathematica and the Wolfram Alpha website. He lives in Urbana, Illinois.