Ron Raper in Powder Springs is outstanding. If you're looking for a guy who is going to spend 30 minutes being your player's cheerleader, he ain't your guy. He expects the player/student to listen and work. If the kid cops an attitude, he'll call them on it..not in a rude or inappropriate way...but he will call them on it. My son (16U) has been going to Ron for 3 years...he'd seen two other instructors between 10U-13U...Ron is hands down the best we've seen.
PM me and I'll forward you his contact info, if you'd like.