Hi and welcome to the Chiari forum.
I am Up in Allentown and went down to Philly and was referred to a "Chiari" specialist BUT that Dr could not help me and had no suggestions of whom else I might see. So, I really am not aware of any Dr in Philly that is a true Chiari specialist as my personal experience does not support it. I actually went up to NY to TCI and was well pleased with my Drs and care up there.