Willem Lammers, MSc, DPsych, TSTA, is a chartered clinical and social psychologist, a psychotherapist, and a consultant to people and organisations. He also certified as a Teaching and Supervising Transactional Analyst (TSTA) and as a Doctor in Psychotherapy by Professional Studies at Middlesex University. Since 1987 he has been leading a large training institute for coaching, counselling and supervision, ias AG, now in Bad Ragaz, Switzerland.

In his training, practice and teachings, he spent many years on the interface of body, mind and spirit, in systems like transactional analysis, NLP, the Reconnection, the Monroe Institute, and Energy Psychology. In 2005, as a result of these explorations, Willem discovered Logosynthesis and has been developing and training it ever since.

Willem runs a private practice for psychotherapy, supervision and coaching. His teaching activities are taking him to many countries in Europe and overseas. Willem is the author of five books and numerous articles in the field.