Stephen William Hawking (8/Jan/1942 – Present) is a renowned English author, cosmologist, theoretical physicist and Director of Research at the Centre for Theoretical Cosmology at the University of Cambridge. His scientific works include 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 theory of cosmology explained by a union of the general theory of relativity and quantum mechanics.
He is an Honorary Fellow of the Royal Society of Arts, a lifetime member of the Pontifical Academy of Sciences, and a recipient of the Presidential Medal of Freedom, the highest civilian award in the United States. Hawking was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009 and has achieved commercial success with works of popular science in which he discusses his own theories and cosmology in general; his book A Brief History of Time appeared on the best-seller list for a record-breaking 237 weeks.
Hawking has a slow-progressing form of amyotrophic lateral sclerosis (ALS), commonly known as motor neurone disease, that has gradually paralysed him over the decades. He now communicates using a single cheek muscle attached to a speech-generating device.