By 1942 – when he stopped writing to do his World War Two service as an engineer at the Naval Air Experimental Station, Philadelphia – Heinlein had already published almost thirty stories, including three novels which would only later be released in book form.
The original idea came from Campbell, who had incorporated it in the then unpublished novella "All" (in Campbell's The Space Beyond [coll 1976]).
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By the end of his first three years of writing, Heinlein had domesticated the future.
For the next half a century he was the father – loved, resisted, emulated – of the dominant US form of the genre. Unlike most of John W Campbell Jr's pre-World War Two recruits to Astounding, he entered the field as a mature man, already in his thirties, with one genuine career (the military) honourably behind him.