My dad's parents and Edgar Allan Poe for deceased choices. I'd like to spend time with other deceased grandparents too, but it was difficult to only pick 3 people.
For people who are still alive my choices would be Paul Doucette - from Matchbox 20, I think he has an amazing mind, Rob Thomas - I want to know the process behind his song writing and why he seems to be so insecure and Alton Brown - he is a great teacher and great chef, I'd like to get inside his brain as well.