I was sad to hear that Stephen Hawking had passed.
Yes he was born 08/01/1942, he was just  76 years old
He sure lived a long time with whatever his disabling disease was. What is he best known for?
His scientific work was a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction
Of course! He must have been really smart. 
Yes, he sure was. It was shock you to know that he was the first to lay out theory of cosmology
That is a shock.  Cosmology is a fascinating discipline.
Hawking was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. He was a vigorous supporter of the many-worlds interpretation of quantum mechanics.
Hawking achieved commercial success with several 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 British "Sunday Times" best-seller list for a record-breaking 237 weeks. Hawking was a Fellow of the Royal Society
Stephen Hawking
Stephen William Hawking (8 January 1942 – 14 March 2018) was an English theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge at the time of his death. He was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009.
His scientific works included 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.