Taneleer Tivan was a character created by what two people?
Elders of the Universe:  The Collector was the first Elder to appear, and featured in "Avengers" #28 (May 1966), but the idea that he was a member of a group known as the Elders was not introduced until "Avengers" #174 (August 1978). Elders of the Universe:  The character was created by Roy Thomas and Sal Buscema. Collector (comics): The Collector (Taneleer Tivan) is a fictional character appearing in American comic books published by Marvel Comics.
Roy Thomas and Sal Buscema