Pathological Demand Avoidance isn't really a thing in the US. I think a behavioral therapist that deals with oppositional and other behavioral issues and has experience with autism would be a better bet.

HI everyone, my 20 yr. old stepson has been diagnosed with Autism (very high functioning=old "Aspberger's"), with the Pathological Demand Avoidance profile--a VERY difficult type to control/interact/live with. Are there any psychiatrists (need anti-anxiety meds) and psychotherapists you know of in Northern VA who may be experts in this area? Thank you!