I get the impression there were a number of people after Voronoff who became famous for this in different countries.

Yeah, a lot of those old news stories on the subject spoke vaguely of "rejuvenation" when what they were really talking about was the H*3*R*8*4*L !!;!! V*!*4*G*R*4 of its day. But it still ended up mentioned in SF as an immortality treatment.