In no particular order: Michael Moorcock(Count Brass, Elric), Robert Silverberg(Majipoor), Poul Anderson(boat of a million years and others), Frederick Pohl(Gateway), Philip Jose Farmer(To your Scattered Bodies Go, the other Riverworld novels), Roger Zelazny(Amber series), Robert Heinlein(anything of his), Philip K. #$&*@!(anything of his), Alfred Bester(anything of his)
There are others in my collection that I'm missing but can't remember right now.