Claparède's relevance lies not so much in his writings as in his insights, having lived his Calvinist and international Geneva to the full. Having lived in a Protestant environment with his father as a pastor, his brothers Alexandre as a missionary and René as a philanthropist, his Protestant Geneva has as its reference point Christian social thought with all its political and social consequences; the international dimension was for him a horizon and a project: his psychology and pedagogy were born and developed from these two realities. His psychology aims to understand the laws of mental development and to ensure that people know and appreciate their own country but also understand and interact with people from other cultures and with different values; far from nationalism, his ideal was civic-mindedness, internationalism and pacifism for a harmonious coexistence between peoples. Geneva, the seat of the League of Nations, was the place where a lasting peace based on the defense of human rights could be built. His pedagogy, based on research, is a revolutionary pedagogy based on the discat a puro magister where the center of attention and care is the pupil with his rights, interests, needs, requirements and perspectives. There is another important value in Claparède: liberalism, which he considered the most suitable context for a truly human development; it was also a working method to understand the many social and political distortions. All these elements come together in the foundation and management of the Institute J.-J. Rousseau.