Being a huge sci-fi fan, I have every episode of the original Twilight Zone plus the remakes and both versions of the Outer Limits, all on hard drive. I saying that, here is a list of my favourite sci-fi authors. I would have read over 90% of these authors' complete literary output.
Philip K. Dick
Harlan Ellison
Ray Bradbury
On a different note, one of the best novels I have read is the obscure Deadly Perfume by Gordon Thomas. Written in 1997, it details terrorists using anthrax to poison masses of people in numerous countries. Very prophetic when you consider the anthrax attacks in the US shortly after 9/11. My copy got destroyed in the 2011 Bundaberg floods....damn it.
Another is Tom Clancy's Sum of All Fears. But they botched the movie something shocking.
Third is Escape From Alcatraz by J. Campbell Bruce. The only book I have read non stop from start to finish. But it was a mere 224 pages long!