“Although a co-worker and I had both studied Dr. Cialdini’s books and taken the Principles of Persuasion workshop we recently came across a problem that confounded us. We were just too close to it to apply the principles to it effectively. Fortunately, Dr. Phelps was able to solve it for us, and in a much more powerful way than we had hoped for. He is an outstanding resource even if you have taken the Principles of Persuasion workshop, and an even greater resource if you have not. I cannot recommend him highly enough.”