As the President of the German Association of Psychotherapy, Karl Nielsen addresses psychology through a wide-field as Coaching Psychology, Neuro-linguistic Psychology, business Psychology, health-care Psychotherapy and clinical psychology. Karl Nielsen is the co-founder and co-developer of the World Council of Psychotherapy and Neuro-linguistic Psychology (NLPdy) and NLP based on scientific data. He is the Headmaster of the International School of Psychology within the field of Clinical Psychology and has been appointed as permanent teacher of the Central University of Nicaragua, the division of International programs, he is also in charge of the School of Psychology, within the field of clinical psychology and human development. Moreover, he is the president of the International Association of NLP Institutes (IN) www.nlp-institutes.net and the CEO of the NLP and Coaching Institute of Berlin www.nlp-nielsen.de. As a founding member, he is actively involved in the development of ICI International Association of Coaching Institutes www.coaching-institutes.net and the WHO (World Hypnosis Organization) www.world.hypnosis.org. As a scientific researcher at the Central University of Nicaragua, he is focusing on human development, international university programs development and on the work of a sociologist as social therapists and sociological studies of long-term families at the university of Berlin.