L. Sprague de Camp — American Author born on November 27, 1907, died on November 06, 2000

Lyon Sprague de Camp — known as L. Sprague de Camp — was an American writer of science fiction, fantasy, non-fiction and biography. In a career spanning 60 years, he wrote over 100 books, including novels and works of non-fiction, including biographies of other fantasy authors. He was a major figure in science fiction during the genre's heyday in the 1930s and '40s... (wikipedia)

The story of civilization is, in a sense, the story of engineering - that long and arduous struggle to make the forces of nature work for man's good.
There is no mistaking the dismay on the face of a writer who has just heard that his brain child is a deformed idiot.
It does not pay a prophet to be too specific.
In writing a series of stories about the same characters, plan the whole series in advance in some detail, to avoid contradictions and inconsistencies.