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In 1830 de Sellon founded the Society of Peace, a forerunner of the League of Nations and the United Nations Organization (UNO).
The exhibition was designed by referring to the definition of sustainability that was established by United Nations Organization at the two world conferences at Rio (Earth Conference, 1992) and Johannesburg (Rio +10, 2002).
In 1993 he was Chief Administrative Officer of the joint United Nations/Organization of American States Human Rights Monitoring Mission in Haiti (MICIVIH).
Traditionally, Paraguayan diplomats at the United Nations backed regular proposals at the UN General Assembly sessions for the return of Taiwan into the United Nations' Organization.
He was Co-Founder of the Graduate Institute of International Studies (now IHEID), Professor of Economic History at the University of Geneva, Rector of the University of Geneva, Director of the Mandate Department of the League of Nations, and Swiss Representative at the International Labour Organization (ILO), as well as at the United Nations Organization (UN) and at the United States Embassy.