Isaac Asimov (1920 – 1992) was an American writer, professor and futurist. Asimov wrote hard science fiction. Along with Robert A. Heinlein and Arthur C. Clarke, he was considered one of the "Big Three" of science fiction writers during his lifetime. Asimov's notable works are the "Foundation" series, "Galactic Empire" series and the Robot series. He linked them, creating a unified "future history" for his stories much like those pioneered by Robert A. Heinlein.
He was famous for adopting the Three Laws of Robotics, and originated the concept of the positronic brain.