I continue to rampage through Robert Silverberg's late 60s-mid-70s run. This guy is a masterful scifi writer. Most of his stuff sounds like run of the mill "What if?" scifi scenarios of the time if you just read the back cover blurb. What sets him apart is how deep he goes into the psychology of the characters and puts you into their heads, without being showy about it.
It's refreshing to get into an author that's all about short, snappy standalone novels. He focuses on one story concept and the characters within it, no extraneous worldbuilding bloat. It's quite a contrast to all the multi-part epics out there.
The darkness and cynicism he touches upon with some of the novels reminds me of J.G. Ballard, except with some recognizable human emotions infused into the scenario. "The World Inside" in particular is very similar to the setup of Ballard's "High-Rise", but he takes it in a completely different direction.
My favorites so far are 1.The World Inside, 2.The Masks Of Time, 3.The Man In The Maze, 4.Downward to the Earth, and 5.The Book of Skulls.