I have been reading Robert Anson Heinlein since I was about 10 years old. To this day, I remember my mom bringing home a copy of Starship Troopers, and while I was completely unprepared for the philosophy which Heinlein was presenting with that book, there was something in it which clearly caught my interest. That said, herewith I would like to put forward my favorite RAH works and a bit about them:
These are the best Bob gave us, though there are plenty more which are due more than a passing glance. I find he has a unique and engaging voice, as well as a positive and optimistic view of the world and at least some of the humans who inhabit it. He also has a talent for making you think and making you question your own assumptions about how the world and the denizens who inhabit it work and behave. I have delighted in his characters and his stories for almost as long as I've been able to read. Do please give him a look.
I would have included "The Door into Summer" for its excellent treatment of time travel, as well as his spot on portrayal of cat behavior. Also, "The Number of The Beast" for its novel method of travelling into different universes...
The Door Into Summer was a slick bit of work, for sure, and certainly deserves to be ranked among Heinlein's best juveniles. If I'm a bit less than enthusiastic about The Number of the Beast, it's because of his use of "lifeboat rules" and "white mutiny" and how they were used against Jake. Was Jake EVER in the military? Not established that I know of, yet he was hammered with both mercilessly when the needed lessons could have been administered with far more diplomacy than was used in those instances.
My memory is poor, but I remember enjoying The Moon is a Harsh Mistress, although I can't remember any details. I may have read some more of Heinlein's, but can't remember. It's been 30-40 years since I stopped reading science fiction and my memory's not up to it.
I also enjoyed Variable Star very much. It´s an unfinished work by Heinlein, finished by Spider Robinson, but I have no idea how much each put in.
The Moon is a Harsh Mistress is still great, a bit difficult to read for me because of the written dialect, but oh! the optimism of the 60s!
I read Variable Star as well, and though it was somewhat reminiscent of his earlier works, it did have its own identity, and I enjoyed what Spider brought to it.
As for Moon, one thing I got a kick out of was how much Russian I learned as a result!