Most likely, Stephen Hawking is the greatest cosmologist of all time. He is known for making popular and accurate predictions. However, he is known for his science background including those about black holes in the universe. Some other topics that Hawking is known for include relativity, gravity, quantum mechanics, and radiation. In the 1990s, he discovered and wrote more about his black hole information paradox.
Many documentaries and movies have been made about Stephen Hawking and his findings. His research and studies began in the mid 1960s and lasted until he died in 2018. He wrote about physics and many papers about his findings in science. After his early death, people were upset by his death, but also upset that this brilliant mind would not be around.
Probably Stephen Hawking is the greatest cosmologist and that is why his ashes are in such presitigious company and such a presitigious location - next to Einstein in a corner of Westminster Abbey. He proved that Time has a beginning; he greatly advanced our knowledge of black holes; but above all, showing how gravitational physics and quantum physics fit together. What more can anyone ask of any one individual?
Hawking believed that the quest for a complete theory of the universe should be accessible to everyone, at least in broad principle. Hence the writing of A Brief History of Time, a scientific classic for all time.