When I started looking for a doctor of any specialty, I Google that specialty and RSD/ CRPS and the name of the location. That's how I found a doctor who sits on the rsdsa.org board. He had been helpful at finding other doctors that know about this as well.

The National Rehabilitation Hospital in DC knows RSD and is a top hospital. I don't think they have neurologists that can be seen there, but I saw one across the street that is super knowledge and highly rated.

Good luck!