Question

A brief history of time a modern classic.to help non scientists understand fundamental questions of physics and our existence was written by

Answer 1

Stephen Willam Hawking

Answer 2

Hey.

Here is the answer.

A Brief History of Time was written by Sir Stephen William Hawkins ,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. 

Thanks .