Isaac Asimov (1920?– 1992) was a Russian-born American author and professor of biochemistry, a highly successful writer, best known for his works of science fiction and for his popular science books.
One of his legacies is the science fiction pulp magazine, Asimov's Science Fiction, which is still published to this day. Harry Turtledove has published several of his short stories in Asimov's. For Asimov's part, he wrote the forewords for Turtledove's anthologies Agent of Byzantium and A Different Flesh.
In the 1950s, Issac Asimov found a challenger to his title of preeminant science fiction writer in the form of Mark Gordian, who, in the years between 1949 and 1953, had published more fiction than Asimov.