Ross Center and Behavioral Therapy Center mentioned above both do adults.
In DC there is the Capital Intitutr of Cognitive Therapy. My adult daughter sees Dr. Jessica Nemeth there, and it has been an excellent match after several that didn't really click.
I am looking for someone to work with my 8th grade daughter on anxiety issues. Does anyone have a cognitive behavioral therapist in the Bethesda(ish) area who you would recommend? Thanks in advance.