He became editor of Analog Science Fiction after John W. Campbell's death; after leaving Analog, he went on to edit Omni magazine[?].
He was the science advisor for the failed television series The Starlost, leaving in disgust after the airing of the first episode; his novel The Starcrossed was loosely based on his experiences.
The most common primary sources are journal entries or letters.
As a general rule, modern historians prefer to go back to primary sources, if available, ...
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