Can you tell me anything about Stephen Hawking?
Stephen Hawking was a seminal figure in the science world, very well-known. As an English theoretical physicist, cosmologist, and author/director of research at the Centre for Theoretical Cosmology at the University of Cambridge, his life was science. 
You said he was an author. Can you tell me which books he wrote?
One of his most popular works was a book called The Grand Design, where he paired with Loenard Mlodinow, published in 2010. This work examined the history of scientific knowledge about the universe and explained the 11 dimension M-theory, and also stated that a Unified Field Theory, proposed by Einstein, didn't exist! 
Can you tell me anything else about his discoveries or theories?
So, Hawking was the first person in history to put into the world a theory of cosmology that was underpinned by a union of general theory of relatively and quantum mechanics. What's more, he was a huge supporter of the many-worlds interpretation of quantum mechanics, and it was a large part of his work.