Stefano Keller is a Swiss-based psychopedagogue and language teacher, originally from Hungary with a BSc (1975) and an MA (1980) from Budapest and further studies in psychoanalysis at the Stiftung Szondi-Institut, Zürich (1980-83), and in language teaching methodology, with a Diploma of the Internacia Esperanto-Instituto (IEI), the Netherlands, 1984. He has taught Esperanto in Switzerland, Sri Lanka (the Universities of Colombo and Kelaniya) and other countries. He has worked with a range of Swiss NGOs. He was the Project Manager of educational and humanitarian projects in Asia as a delegate of Terre des Hommes (1986), Sentinelles and the Swiss Red Cross (1987). He was the director of refugee centres in Switzerland (Swiss Red Cross, 1989-1991).

He has a particular interest in linguistic minorities, the aspects of intercultural communication, language policy and the equitable solution of the international communication through linguistic human rights. He participates in the work of advocacy groups in favour of indigenous peoples and minorities. He is the webmaster of multilingual websites and has contributed widely to discussions on the issues of linguistic rights, minority language use, as member of discussion lists, author of articles and contributor in blogs and social networks on the Internet.

Since 2006 Stefano Keller is the secretary of the Swiss Esperanto Society (SES). In 2008, Stefano Keller was one of the main organizers of the Symposium on Linguistic Rights, held at the UN in Geneva. Since January 2009 he is the chief representative of the Universal Esperanto Association (UEA) to the United Nations Office in Geneva. He is member of the Minority Research Network (MRN) from the beginning, 2009. Since july 2010 Stefano Keller is member of the Executive Board of Universal Esperanto Association.

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• Lingvaj Rajtoj - Homaj Rajtoj, difinoj kaj realeco. Agado de UEA por lingvaj rajtoj.
  Basic presentation in Esperanto (Stefano Keller & Tove Skutnabb-Kangas) of Linguistic Human Rights and the work by the Universal Esperanto Association at the United Nations on Language Rights. Sveda Esperanto-Kongreso, Karlstad, 10-12 majo 2013. (PDF-versio)
  Also on: www.tove-skutnabb-kangas.org/en/PowerPoint_presentations.html