Jean-Pierre Willem, surgeon and anthropologist, has traveled the globe for forty years. Combining human sciences with biology, he became aware in the field of the great health disparities among certain peoples based on several criteria (nutrition, psychological balance, physical and mental activities, environment, etc.). He chairs several institutes in Paris. He leads "Médecins aux pieds nus" (Barefoot Doctors), a humanitarian association using ethnomedicine and medicinal plants, and directs the Faculté Libre de Médecines Naturelles, which is open to the public. All data collected in the field is recorded in the Union Biologique Internationale.