Was well known prior to 1970 but greatest fame came after 1970
Not a media mogul, although his enterprise expanded after his death
Died after 1990
Not from a famous family
My enterprise involved producing tangible items, but not necessarily considered manufacturing (as in factories and machines)
Caucasian
I am a publisher
My enterprise does not involve food/drink
Died of natural causes
I published periodicals, with excerpts reprinted in book form
Publications not necessarily aimed at a specific audience with regards to race, sex, or ethnicity; you might argue the publications were embraced by a specific group, but its appeal was broad.
My wife asked me when we were in NYC a year and a half ago why we were walking up Madison Avenue from 34th Street. I had to tell her that there was no way I was going to leave Manhattan without a selfie in front of 485 MADison Avenue.
I think I was the last to host. If no one minds a break with protocol, I’d like to turn over host duties to @kitap since they asked the question that yielded the solution.
Answers 23&24 had me convinced it was the publisher of Reader’s Digest - William Roy DeWitt Wallace. Not that I knew him off hand, had to look up in Wiki who published RD. Believe it or not, died in 1981, so that still filled requirements… Oops, no it wouldn’t. Missed 16. Still, pretty damned close.