I am under the impression that he is in fact in the Philadelphia area. My good friend GM Ian Cyrus has coordinated several seminars for him. I believe that you can get his contact info from his website:
DJN Ji is living here in NJ for about 11 years now. With a brief 2 year stint in PA a few years back. His home is in Trenton, where he lives with his wife. This is fact since I have been to his house more times tham I can count and see him almost every week, unless he is away. If you need to reach him you are welcome to email me a message which I will hand deliver. I am not at liberty to give out his personal cell #. Hope this helps you.