Manfred Rudersdorf (left) has no Wikipedia article. As an historian he is expert on the history of "his" university. In the picture you see the presentation of this book to the rector of the University of Leipzig.
When you inspect the Reasonator page for Mr Rudersdorf, it is remarkably complete. It demonstrates that the inclusion from sources external to the Wikimedia Foundation slowly but surely results in proper information.
When you think of it, finding people like Mr Rudersdorf is obvious. There is only one sum of all knowledge and much of it is connected in one way or another. In fact it is a puzzle and we Wikimedians are all too familiar with puzzles.