"However difficult life may seem, there is always something you can do and succeed at." Stephen Hawking quote. Stephen Hawking is an English theoretical physicist, cosmologist, author and Director of Research at the Centre for Theoretical Cosmology within the University of Cambridge. Among his significant scientific works have been a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity, and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Hawking was the first to set forth a cosmology explained by a union of the general theory of relativity and quantum mechanics. His bestseller "A Brief Theory of Time" was sold more than 10 million copies in 20 years. A movie "The Theory of Everything" was based on the memoir "Travelling to Infinity: My Life with Stephen" by Jane Wilde Hawking, his first wife with whom he have three children and three grandchildren by now.