"Who Goes There" is a classic and he wrote some good serious sci-fi under the pseudonym Don A. Stuart, a play on words of his first wife's name Donna A. Stuart. He took it to publish himself in Astounding. Astounding. He was a character. I've related the story before, but I got stuck in an elevator and the WesterCon sci-fi convention, with Anthony Boucher
and Richard Matheson. He broke out a flask of good cognac and we sipped, waiting for the elevator to be fixed -- it was about ten minutes to half-an-hour but by that time I was nearly choking on his cigar smoke (he was a chain smoker). He believed that Dianetics was going to supplant Fruedian psychology and win L. Ron Hubbard the Nobel Prize. Astounding!
There may have been a core of truth in the "discovery," used by, among others, the inventors of Bio Feedback (which does work).
"Who Goes There" is an absorbing read, the first to approach aliens who could morph into many forms of life and now exploited in movie after movie, TV series after TV series, mostly as a plot gimmick.