(August 1, 1910-August 15, 1977)
Ziff-Davis acquired Amazing Stories in 1938, sacked then T. O'Connor Sloane and, on the recommendation of writer Ralph Milne Farley, offered the editorship to Palmer. He was the editor of Amazing Stories from 1938 through 1949. During this time, he was responsible for turning the venerable magazine into an embarrassment to fandom. See Palmerism. The Shaver Mystery was probably the most egregious example.
When he left Ziff-Davis he set up his own company to publish and edit Fate Magazine, and other, similar, occult drivel, as well as several books related to flying saucers, including "The Coming of the Saucers," co-written by Palmer with Kenneth Arnold. He did publish the more-or-less straight SF magazines Imagination and Other Worlds.
For more, see http://www.sf-encyclopedia.com/entry/palmer_raymond_a