According to this answer, there is not even one grandmaster on Chess Stackexchange.
What a pity, especially when one considers the abundance of top experts and famous professors on e.g. Math Overflow.
My instinct is that there is a real opportunity to incorporate more, if not as much, expertise on this site.
My proposal is that Stackexchange should take the initiative and get in touch with grandmasters and international masters. Invite them to join. Those titled players who have academic backgrounds will be especially valuable.