I think your best bet would be to visit our New Jersey and New York message boards. Perhaps the members on those boards would know of a good dermatologist.
New Jersey
http://messageboards.ivillage.com/iv-ppnewjersey
New York City life
http://messageboards.ivillage.com/iv-hgnyc
New York
http://messageboards.ivillage.com/iv-ppnewyork
You'll find some information here on female pattern hair loss
http://skin.health.ivillage.com/alopeciahairloss/femalepatternhairloss.cfm
Lots of luck!