# Brian Greene

From Conservapedia

**Brian Greene**, author of *The Elegant Universe* and professor at Columbia University since 1996, is one of the most famous proponents of string theory.

Greene's most significant contribution to string theory is his application of Calabi-Yau manifolds to string theory's extra dimensions. According to Greene, these manifolds describe the shape of the extra dimensions.

When string theory's extra dimensions take on the form of Calabi-Yau manifolds, the theory retains an important symmetry called "conformal invariance".