God said:
Be straight up with him, tell him he is bothering you and invading your personal space, or something. If that doesn't work ignoring works well enough.
Despite what counselors and a lot of other authority figures tell people as a way of shifting the work to you would say, simply "ignoring" something does not make it go away.
Say you're sitting in a room. Then let's say in this room there is a fan, and this fan is making a buzzing noise at regular intervals of one time every second because it's off balance and has been stuck in this perpetual pendulum for a long time. Eventually you will begin to hear this creaking noise less and less because your mind is beginning to tune it out. Eventually you can no longer hear it, as you are now completely ignoring the sound from the fan.
This doesn't mean the fan has stopped making noise, because it still is, you've just begun ignoring it. Just because you don't acknowledge something doesn't mean it ceases to exist or continue in its action or routine.
The best solution is to fix the problem. Then you don't have to ignore it because it is no longer a problem.