Well, I and another person (who was Knapp's client at that time) were moderators and administrators of his forum. He began to share with us that he was going to create a non-profit anti-cult organization and wanted us to join it. He never answered my questions regarding this organization, keeping saying that he would send us a business plan (which he never did). On the other hand, he kept trying to involve us into it and even acted as if we already joined it (although I never gave my agreement to join it). I did not like this. In addition, I remembered that in the past somebody accused him of using manipulations. I knew that this person was knowledgeable about NLP. So, I suspected that Knapp used NLP (now I am quite sure that he does). I asked him about his attitude to NLP. He replied only when I asked him the third time. He admitted that he studied it, but denied that he used it.
Very soon after he eventually answered this question, he and I got a serious conflict over a small matter (the other moderator and administrator tried to keep neutral position). We discussed such things before many times and did not have any problems. This time he behaved as a different person: he kept writing offenses, threatens, manipulations. I did not expect such behavior from him. Actually, he misunderstood my position regarding the matter we were arguing about. When I explained my position again, he agreed with me and it seemed that the conflict would be solved. However, unexpectedly, he changed his behavior again. He sent me and the other moderator and administrator an ultimatum email. The main idea was: "either you agree to submit to me in everything or you have to resign within 24 hours." I did not reply him at all (and never contacted him again). He deleted his forum in about 11 hours after he sent us that email. The other person tried to contact him, but he replied that he did not want to continue their contacts.
Well, this is what happened between us. I think that Knapp intentionally created this conflict because I began to suspect that he used NLP and other manipulative techniques. I think he also used them before, when he involved us as moderators and administrators of his forum and when we were helping him with his forum. However, I was not aware of it at that time.
The opinion of the other co-moderator and co-administrator of Knapp's forum who was involved into this conflict can be read here.
Regarding the question whether Knapp practices NLP (neuro-linguistic programming), I am sure he does. By the way, since he is LMSW, he is required to have a supervisor who is LCSW. His supervisor and her husband are certified NLP trainers. Knapp and his supervisor even had offices in the same building. Well, there is nothing illegal with having a supervisor who is a certified NLP trainer. However, this is a perfect situation for the deep and thorough study of NLP. So, to me, it indicates that Knapp seriously studied NLP. People usually study NLP in order to use it, not just to have information about it. And I am sure that he did use NLP toward me and other people.