If you're into stuff like this, you can read the full review.
"In 1963, Asimov argued that science fiction appealed to an existing type of curious reader, but today, it seems more likely to subtly alter the way in which we all think and feel."
In "Astounding: John W. Campbell, Isaac Asimov, Robert A. Heinlein, L. Ron Hubbard, and the Golden Age of Science Fiction" by Alec Nevala-Lee
"'How long has this racket been going on? And why didn't anybody tell me about it sooner'"
Heinlein to Campbell after selling "Life-Line" in 1939, In "Astounding: John W. Campbell, Isaac Asimov, Robert A. Heinlein, L. Ron Hubbard, and the Golden Age of Science Fiction" by Alec Nevala-Lee
"'There are about five consistent, adult science fiction writers in the business: de Camp, Heinlein, Hubbard, van Vogt, and, if he'll only work at it a little, del Rey.'"
In a letter from Campbell to Heinlein, In "Astounding: John W. Campbell, Isaac Asimov, Robert A. Heinlein, L. Ron Hubbard, and the Golden Age of Science Fiction" by Alec Nevala-Lee
I started reading science fiction in the '80s. I never enjoyed the Hubbard stories I read in anthologies. Then I found out about Dianetics. His self-created biography including multiple resurrections was more fantastic than any of his fiction. :-) Campbell, as many have observed, took science fiction to “another level”. I'm a little surprised Andre Norton was omitted in this write-up.