There is this guy who used to play for Clemson, then went pro, and now works as a middle school sub and does public speaking. In addition to that he raises money for kids in his home town, and runs a football camp there in the summer for kids who need it. He is not an "expert" on aces, but he is really making a difference in the lives of kids with Aces.
http://www.therickysappfoundation.org/