Trained in America he has been associated with Don Dinkmeyer, Ph.D, author of over 30 books and the founder of the Systematic Training for Effective Parenting (STEP) which is used throughout the world. Dr. Dinkmeyer was David’s mentor during his doctoral studies. David has also studied with Albert Ellis, Ph.D., one of the pioneers of cognitive-behaviour therapy. During his course of study David was enrolled in the Institute for Rational-Emotive Therapy in New York.