Jayaprakash Satyamurthy
Knivesout no more
Yes, but they were originally published under the name Lewis Padgett, which often served as a collective surname. It was under this name that I first read some of them in the excellent classic SF anthology Adventures In Time And Space: Adventures in Time and Space - Wikipedia, the free encyclopedia , which is why I've always suspected that they may have been collaborations even though Moore protests otherwise.