In recent years, NG's photography has been all-over-the-boards in style and substance. Joel's photography is modern classic National Geographic. Just as the old signature look was to have the "red sweater" in the photographs somewhere, his photography represents a continuity not just from one article to the next but from our current generation to the past.
This isn't to say that Joel is "old school", but that his style respects the "old school" and is a good reference point to work from.