Jean-Pierre Willem, surgeon and anthropologist, travelled the world for forty years. Combining the human sciences with biology, he became aware in the field of the wide disparities among certain peoples in terms of health, according to several criteria (food, psychological balance, physical and mental activities, environment, etc.). He chairs several institutes in Paris. He leads the “Barefoot Doctors”, a humanitarian association that draws on ethnomedicine and medicinal plants, and he heads the Free Faculty of Natural Medicines, open to the public. All data collected in the field are recorded in the International Biological Union.