Colonel,
I have been curious about the Yuan-ti lately, and I was hoping you could shed some light on the origin and development of that group of creatures in D&D. WotC reserves it as their product identity...but I have been reading Howard since I was a lad and my dad gave me some Conan books, and its hard not to notice the Serpent-men of Howard's stories.
As I understand it, the Yuan-ti in D&D begin with I1 Dwellers of the Forbidden City, written by one of your not-favorite people: David Cook. Anyway, I guess the present narrative is that Cook did work for hire, for then TSR owned it, and "his" work is owned by WotC/Hasbro.
But I find myself wondering, did he come up with it, or did someone else at the company, credited or not? And I further find it difficult to believe that it was wholly original to him, but who knows, maybe I am wrong.
I certainly was familiar with the idea of snake people from Howard long before I was from I1.
Anyway, thanks for clearing this up.