As far as the professional life of Stephen William Hawking is concerned, his popular works in the field of science are numerous summing up some of those as follows:
1. Gravitational singularity theorems in the field of general relativity,
2. Hawking Radiation: It is a theoretically proposed radiation which according to him is being emitted by Black holes.
3. He was the first person to propose a theory on Cosmology in the light of quantum mechanics and theory of relativity proposed by Albert Einstein.
Some of the remarkable achievements of Stephen Hawking that he achieved during his lifespan include an Honorary at Fellow of the Royal Society of Arts, Presidential Medal of Freedom, lifetime membership at Pontifical Academy of Sciences and much more.
Stephen William Hawking being a theoretical physics wrote down a good deal of books in which his he proposed his ideas regarding the different aspects of universe especially the theories in the field of cosmology. His most popular book is “A Brief History of Time: From the Big Bang to Black Holes”. This book was the best-seller for 237 weeks repeatedly on the British Sunday Times. A Brief History of Time was publish in the year 1988 and dealt with the Science of Cosmology but the actual reason for it’s success was that this book was made for everyone who was interested in studying it without having to have any prior knowledge about this field. This simplistic approach of this book explaining the most complex mysteries of universe made it a worldwide hit.
The golden age of Stephen Hawking’s remarkable career began in 1975 until when he returned back to Cambridge and was awarded a much reputed post. As the world was showing an increased interest in the study of cosmology, his marvellous came to the light and was awarded with numerous awards during that period namely The Eddington Medal, The Pius XI Gold Medal, and in 1976 the Dannie Heineman Prize, the Maxwell Prize and the Hughes Medal. He also went on to  receive  Albert Einstein Medal and an honorary from Oxford University. He continued to flourish in the field of cosmology by proposing multiple theories especially on Black Holes.
Stephen William Hawking at the age of 76 left for heavenly abode, early in the morning of 14 March 2018 at his home. He was suffering from Amyotrophic Lateral Sclerosis  (ALS) that eventually paralysed him completely over a course of time. With the help of Speech Generating Device, he was able to communicate his ideas which was attached to a single cheek muscle.