James Garner and RIchard Boone, respectively, also had a lot to do with their popularity.
Gene Roddenberry wrote several HGWT episodes. I hear he did rather well for himself when he did some crazy space travel show later in the '60s.![]()
Of course, his writing was never as good after HGWT - especially including the crazy space travel show. And he was a terrible show-runner. ST:TOS and ST:TNG both improved when he was pushed away from direct involvement. So did the movies. Been watching episodes of some even crazier space travel shows on You Tube: Space Patrol, Tom Corbett Space Cadet, Captain Video, Captain Z-Ro. Terrible writing.
Some of the best writing was "The Adventures of Robin Hood." No surprise. Those were outstanding movie writers who had been blacklisted and were writing under pseudonyms. And Rodenberry gets credit for dealing with controversial issues by setting them in the future. Robin Hood dealt with extremely controversial and even dangerous issues by setting them in the middle ages.