[TexasSP]

I think it's time for a nice heart to heart talk with him, in person, in private. I would let him know in no uncertain terms what he is doing is unappreciated and unwanted, this is the way things are and he needs to deal with it and move on. Let him know that if pushed further you will have to change your approach to the situation. Leave it at that and let him imagine what your further actions will be. Never bring up fighting or anything else and don't let him get you riled up. Say it with confidence and force but do not yell. A lot of times being calm and collected yet firm and forceful can really put the message across better than anything else and leaving a little unknown in there (ie: your further actions) adds to the intimidation factor.

This is something I have learned in management that is quite effective. You often have to deal with all types and many of these will be tough. Always play your cards tight against your chest as not to show your hand and always leave your options open. Try never to make specific threats in other words.

If it gets past a certain point, you may have to "slap the guy down" so to speak. I am not suggesting using physical violence but you will need to find a course of escalation that really pushes the point across. What that course is is entirely up to you and what you feel is best situated to address the problem.