And of course, it's The Narrator. I don't know if they still use them, probably not, but I went to elementary school in the 70s, and they were still using the old 50s science educational documentaries, which were invariably narrated by the same guy. Old Disney wildlife 'documentaries'(1) too. I don't know who he is or if he's still alive, but he's as familiar and recognizable to me as the Movie Trailer Guy ("In a world where...")
(1) As we know, Disney 50s documentaries were even worse than the usual run of wildlife documentaries as to truth and accuracy.