Went to Gelb 10 years ago for chronic TMJ and was amazed at his specialty in this area. Due to changes in my life and age 12 months ago the TMJ came back with a vengeance. Went back to Gelb and found relief from the pain within a matter of weeks. He has continued his research and expertise in TMJ. It would be safe to say he is probably one of the leaders in his field in the USA.