What to Recommend?

A person I know is new into Science Fiction.  As a (very) longtime SF fan he asked me what to start with to get into the genre.  I told him to start with Heinlein’s “Juveniles” and work up from there.  IMO they’re a good intro to the genre.  They’re available as a compilation in “The Past Through Tomorrow.”  From there work your way up through his other works: “Starship Troopers” (My favorite book); “Stranger in a Strange Land:” etc. And work through s0me of the sub-genres.

 Any other suggestions for my friend?