Peter Thiel: His contrarian views enlightened me many many times, for example his views that higher education is not a temple of knowledge anymore, but a big elitist economic bubble. I also suggest you read his book Zero to One, I liked it a lot.
Elon Musk: One could argue he's not really a thinker, since he's working so much on his businesses. Even so, it's evident that he thinks a lot and very deeply. He's willing to figure out the big picture of what's good for humanity and go all-in on it.
Rand: Her philosophy and her system of values which is in a deep contrast with what is preached everywhere else. This would be a start: https://www.youtube.com/watch?v=mQVrMzWtqgU