The Variable Man (a collection of short stories) was the first one of his I read, assigned in English class...
I thought about this a little, that class was science fiction only. I'd already taken English I and II, and needed a third. The only other English class option that quarter was a class writing and given speeches, so the choice was easy.
The other books we were assigned were -
A Canticle For Liebowitz - Walter M Miller
Solaris - Stanislaw Lem
Childhoods End - Arthur C Clark
The Left Hand of Darkness - Ursula K Le Guin
To Your Scattered Bodies Go - Philip Jose Farmer
The Variable Man - Philip K Dick
And some book about a kid with a telepathic dog (or something like that), which I didn't like.
There may be one or two others I'm not remembering. It was a pretty good list, and didn't just go with more obvious stuff.
The thing I remember most about the class was playing hangman in the back of the room with a friend, using only the letters in the professor's name. Also, who could name (write down) the most current and former Seattle SuperSonics players. The books were good, but class discussion was less than riveting.