Brian Greene is a physicist who is considered one of the world's foremost string theorists.
As of 2003, he is a professor at Columbia University. He is the author of The Elegant Universe, a popularization of superstring and M-theory. The book moots Calabi-Yau manifolds as the multi-dimensional (11D, 16D, 26D) points which comprise our space-time. The Elegant Universe was later made into a PBS television special with Greene as the narrator.