I can ask the harp e-mail mailing list for contact info on harpmakers in Maryland.
If anyone wants to join this list the easiest way to subscribe is to go to:
harp mailing list
It's a really good mailing list, very similar to Mudcat, lots of great people, sharing info and friendships, with the occasional ruffled feathers but lots of people rushing in to smooth things over and get things back to normal.
There is also a harpmaker's list but I'm not quite sure how to find that. If anyone wants to know I'll find out.