This chapter recounts the path of a psychiatrist who has specialized in family therapies since 1968. The author describes his work as the manager of a mental health centre in the South of Bronx in the USA as well as his instrumental contribution to the establishment of the international network for "Alternatives to Psychiatry" and to the founding of EFTA. He then relates his main contributions to the field of family therapy such as network practices, the application of I. Prigogine's theory on systems far from equilibrium to family systems, the introduction of a new model for couple therapy as well as the development of "resonances' and "assemblages' concepts.