Bernhard Trenkle, DIPL.PSYCH., is Director of the Milton Erickson Institute Rottweil Germany, and member of the Board of Directors of the Milton Erickson Foundation. He is member of Board of Directors International Society of Hypnosis ISH and past President of Milton Erickson Society of Clinical Hypnosis Germany (1996-2003). Author of Ha Ha Handbook of Hypnosis and Psychotherapy a bestselling joke book in Germany (now translated in English, Russian, and Italian).
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