I just read one of Masterson's books, and it was good. The book I read is The Search for the Real Self.

Another good approach for BPD is Dialectical Behavior Therapy. I'm readint the book on that now (Marsha Linehan: Cognitive-Behavioral Treatment of Borderline Personality Disorder). I feel like she understands too.

I'm just an intern now, but I am very interested in BPD and want to learn how to treat people who have it. There are others who treat it too. My T doesn't seem to diagnose personality disorders if she can avoid it, and apparently doesn't like the concept, but she uses elements from DBT, and a lot of what she does is familiar after reading Masterson. She's a trauma specialist. Any therapist who works with Dissociative Identity Disorder would probably be good with BPD also. Both disorders have a very similar etiology (usually abuse is a big factor). Dissociation is also a common part of BPD too. The way that I see it, I feel that BPD and DID are more like degrees of the same thing than totally separate disorders. Of course, it's probably about as hard to find therapists who want to work with DID clients. But look for therapists who do trauma work, and who recognize how important relationships are in that.