Brian Greene is a physicist and one of the best-known string theorists. His book, “The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory”, was a finalist for the Pulitzer Prize in nonfiction, and winner of The Aventis Prizes for Science Books. His second book was “The Fabric of the Cosmos”.
Greene also dabbles in acting having helped John Lithgow with scientific dialogue for the television series “3rd Rock from the Sun”, and had a cameo role in the film “Frequency”. He was a consultant in the time-travel movie “Déjà Vu” and had a cameo appearance as an Intel Engineer in “The Last Mimzy”.
Source-Wikipedia
http://en.wikipedia.org/wiki/Brian_Greene