Who are the 'Old Masters' of science fiction?

Answer 1

Chronologically: Jules Verne, H.G. Wells, HUgo Gernsback (also edited radio magazines and oftenworked in sci-fi ideas like interplanetary radio odd in technical stuff on three-tube converters, but good icing.,) Robert Heinlein, Ray Bradbury (whose stories often abow a lack of scientific content) Isaac Asimov and Arthur C., Clarke are among the (Old masters)/. Gernsback is the namesake of the Hugo awards, which correspond to literary prizes for sci fi writers, he was also very active in the Short Wave radio hobby and its variants such as Hamj radio, SWL, etc.Asimov and Clarke were legit scientists as well as sci-fi men.