I think that there are a few players around the country - past and present - nicknamed Mountain Man.
AJ is the one known here in the Midwest. He has spent most of his pool playing days either in Missouri, Illinois or Kentucky.
You won't find a picture of him because he won't allow one to be taken.
AJ beats to his own drum. He has incredible pool knowledge and is a great hustler.
When I was younger and worked in the pool room, some guys from southern Missouri would come up every Friday to play. I had AJ waiting for them one Friday night and filled him in on all of their speeds. He worked it like a champ, beating them in order and never showing his true game. He can miss 'safe' with the best of them.
Also, DO NOT EVER ask AJ to go to the horse track. EVER.