When I finished
Isaac Asimov: The Foundations of Science Fiction
in 1981, Isaac had not written a science fiction novel for ten years, and that novel,
The Gods Themselves,
was his first adult science fiction novel in fifteen years. But the year my study was published, Isaac published the first of his science fiction best-sellers,
Foundation's Edge.
It won a Hugo Award and so did my book. After that, Isaac wrote half a dozen major novels, almost all of them best-sellers, and he added another two hundred books to his list. Authors have it within their power to undermine every effort to evaluate their work.