Theodore Sturgeon; born Edward Hamilton Waldo; February 26, 1918 – May 8, 1985) was an American science fiction and horror writer and critic. The Internet Speculative Fiction Database credits him with about 400 reviews and more than 200 stories.
The Science Fiction and Fantasy Hall of Fame inducted Sturgeon in 2000, its fifth class of two deceased and two living writers.
He is the source of Sturgeon's Law, of which the Oxford English Dictionary version is "ninety percent of everything is crap." The long versions is, "I repeat Sturgeon's Revelation, which was wrung out of me after twenty years of wearying defense of science fiction against attacks of people who used the worst examples of the field for ammunition, and whose conclusion was that ninety percent of SF is crud. Using the same standards that categorize 90% of science fiction as trash, crud, or crap, it can be argued that 90% of film, literature, consumer goods, etc. is crap. In other words, the claim (or fact) that 90% of science fiction is crap is ultimately uninformative, because science fiction conforms to the same trends of quality as all other artforms."
See the full Theodore Sturgeon article on Wikipedia.