Paul Hooijdonk is a regression therapist trained at Tasso in the Netherlands. In addition, he works as organizational consultant, specializing in guiding individuals with ineffective communication patterns in the workplace. These patterns often stem from unconscious emotional blocks and early childhood experiences. In the study, his role was to coordinate the collaboration between the regression therapists who conducted the sessions, the organizations that sent the validated questionnaires to clients, and Bé Groen, who supervised and carried out the research at a scientific level.