Somehow, I think you are talking about Leonard R. Kahn of Kahn Research
Laboratories in Freeport, Long Island, NY, and not A. Q. Khan of Khan Research
Laboratories in Kahuta, Pakistan (Pakistan's main nuclear weapons laboratory
as well as an emerging center for long-range missile development). Leonard
Kahn is best known for his paper: L.R. Kahn, “Single Sideband Transmission by
Envelope Elimination and Restoration,” Proceedings of the IRE, Vol. 40, July
1952, pp. 803–806., and for his work on AM stereo. Google somehow doesn't
know the difference...

Yes, it was Leonard Kahn. I have an Kahn SSB adapter for 455-KHz IF receivers.
It employs a great deal of nuvistors. Very complex machine!

73

Tony I0JX