My Spouse Introduced Me...My spouse introduced me to Heinlein's work back when we were just getting to know each other. I've since been gobbling them down and after years have re-read many of them repeatedly.
I've never been a huge fan of science fiction writing until Heinlein's stories were shown to me. The more science, less fantasy style of them sparked my interest in SciFi readings and I've enjoyed acquainting myself with a few other authors who lean that direction.
I enjoy his characters greatly, especially his realistic females. So far they are the most honestly and accurately portrayed I've ever come across.
Amusing and often thought-provoking, whatever your own opinions on a subject tackled are...