The 5 W's of JG

Today I saw a bumper sticker that read "Where's John Galt?". I always thought the question was "Who is John Galt?". I didn't know I was supposed to know where he is at. I was just trying to determine who he is. That lead me to wonder if "When is John Galt?", "What is John Galt?", and "Why is John Galt?" are all legitment questions. If anyone knows him and has found John, let me know, and then I can ask him some more questions.