“This man knows so much about his field, I’m too dumb to interview him. He’ll think I’m stupid.” The reason he knows so much about his field is because it’s his field; you’re a generalist trying to make his work accessible to the public. That means prodding him to clarify statements that are so obvious to him that he assumes they are obvious to everyone else. Trust your common sense to figure out what you need to know, and don’t be afraid to ask a dumb question. If the expert thinks you’re dumb, that’s his problem.
