After completing his medical studies in 1978 (specializing in pediatrics and sports medicine), Jean-Louis became a Trager practitioner in 1985. For 13 years, he practiced Trager in the geriatrics department of the hospital of La Rochelle (F). After his second encounter with Dr. Milton Trager, he obtained the status of Trager tutor in 1993. He later became a Mentastics Teacher and Trager Instructor. In 1997, he authored a report on touch in the elderly while specializing in geriatrics. In 2005, he completed his training in neuropsychology. In 2006 he designed the optional Trager course: "Exploring and Understanding the Skin" and in 2016 the course "Trager and Pathology".