Golden Age

The Golden Age of SF (also known as the Golden Age of Astounding) is generally taken to be from 1939 to the early 1950s and is essentially the period beginning when John W. Campbell assumed the editorship of Astounding and lifted SF out of the pulps and ended when a new generation of modern prozines (IF, F&SF, and Galaxy) arose and successfully challenged ASF and Campbell.

Major SF authors generally considered to be part of the Golden Age include Isaac Asimov, Ray Bradbury, L. Sprague de Camp, Hal Clement, Robert A. Heinlein, C. L. Moore & Henry Kuttner, Frederik Pohl, Eric Frank Russell, and A. E. van Vogt. Towards the end of the era writers such as Poul Anderson, Alfred Bester, James Blish, Arthur C. Clarke, Fritz Leiber, and Theodore Sturgeon emerged.

(Critic Harold Bloom has stated that Arthur C. Clarke, Ray Bradbury, and Fritz Leiber are representative authors of the period.)

There is a widely-quoted bon mot that "The Golden Age of Science Fiction is 12".

See also http://www.sf-encyclopedia.com/entry/golden_age_of_sf