Answers Give Me Questions

I have to admit, PI Sam's answers have left me with questions as I ignorant of some of his answers.  Yes, I do know Magnum PI - Tom Selleck    But I have had to do some sleuthing on some of the other answers, how about you?
I started with "Gateway" by Pohl, never heard of either.  "Gateway" is a science fiction novel, first in a series.  Frederik George Pohl, Jr is an American science fiction author and is 93 years old, his writings are extensive.