Campbell was one of the most influential figures in science fiction history who cultivated a 'stable' of authors; Asimov was his most famous protégé. Campbell's interest in psi was inflamed further by SF luminaries H Ron Hubbard and A E Van Vogt, who started the Dianetic movement a while before Scientology became a 'thing'. (Since Scientology turned into such a cult, it must be pointed out that Van Vogt had nothing to do with its development).
But I'm counter-intrigued: why are so many people in this discussion (and in the article's comments) so vehemently opposed to psi? It's been comprehensively debunked, but Campbell had a neat (and plausible) explanation for that, which no one ever addresses. And many of the most striking anecdotes of psi phenomena have never been adequately explained. This is reminiscent of a consensus reality (https://en.wikipedia.org/wiki/Consensus_reality), which SF readers in particular should be less susceptible to...