I believe Asimov once stated his daily output to be 2500 words--that equates to about 10 typewritten pages. (Explains his prodigious oevre count!) So that will do for the productivity gene.
Of all the assorted writers and genres I've admired, the one who always amazed me with his ability to say something beautifully poetic in the midst of the most visceral scenes of Grand Guignol gore was Don Pendleton.
(The two above are as opposed to Terry Harknett, AKA George G Gilman et alia, who just writes visceral scenes of gore in copious numbers--not that there's anything wrong with that.)
Speaking of Westerns, let's throw in Louis L'Amour, for his unerring sense of place. I've never been to Wyoming, for example, but I feel as though I have--because he told me what it was like.
Warren Murphy and Richard Ben Sapir, for their delicious way with snark.
Diane Duane can make alien intelligences (even including--maybe especially including--cats) accessible in ways no one else can. And she thought of the "Young Wizards" notion long before JK Rowling; she just didn't have the good sense to be born British, which is why she's not a billionaire now.
Hmm. That will do (for now), I think.