Question: Name the American theoretical physicist, mathematician, and string theorist who has been professor at Columbia University since 1996 and who wrote the book 'The Hidden Reality' which explores the concept of the multiverse?
Sentence (from "Brian Greene"): Greene has worked on mirror symmetry, relating two different Calabi–Yau manifolds (concretely, relating the conifold to one of its orbifolds).
Relevant evidence: No