Isaac Asimov
Isaac Asimov (1920-1992) was an American author of hard science fiction and popular science books in addition to being a professor at Boston University. He is considered to be one of the greatest science fiction authors of all time. Asimov is most well known for his Foundation series as well as his Galactic Empire and Robot series (all comprising the Greater Foundation universe). Asimov also wrote mystery and fantasy fiction, proving his versatility as an author.