Pierre Hassner, born 31 January 1933 in Bucharest, Romania; died 26 May 2018 in the 15th arrondissement of Paris, was a geopolitologist and philosopher naturalized Romanian French. He was director of research emeritus at Center for International Studies and Research and at the Paris Institute of Political Studies. He has also taught at the European Center at Johns Hopkins University in Bologna. In 2003, he received the Alexis de Tocqueville award. Biography Of Romanian Jewish origin, Pierre Hassner moved to France in 1948 at the age of fifteen with his parents who were fleeing the communist regime. The same year, he read The Great Schism by Raymond Aron, a book that left a deep impression upon him. He joined the École normale supérieure, obtaining the agrégation in philosophy in 1955. He became one of the students of Raymond Aron and Leo Strauss. In his Memoirs published in 1983, Raymond Aron wrote: "In I do not know what circumstances, Pierre Hassner, who sometimes attended my classes, gave a brilliant, dizzying presentation on Thucydides ... I told him that never, from a student or teacher, had I heard a speech of comparable quality." Under the direction of Aaron, he had begun a thesis, that was never completed. In 1957, he acquired French nationality. From 1992, he assumed the presidency of the Kosovo Committee. Theories Pierre Hassner devoted himself to the study of international relations and geopolitical problems, which he wished to shed light on with philosophy. In his numerous articles and books, he offered informed and original analyses of the evolution of international conflicts during the Cold War era, and after the fall of the Berlin Wall. He thus became involved in the political debate at the time of the war which divided the peoples of the former Yugoslavia between 1991 and 1995. His research focuses on war, violence and totalitarianism, international relations notably in the history of political thought and in Europe after the Cold War. In his theories on totalitarianism and post-Cold War] world political evolution, he analyzed Chinese and Russian political regimes and, to qualify them, coined the neologism of "democrature", to denote States which are no longer under totalitarian regime but are not yet democracies and therefore hide their authoritarian nature under a democratic facade (parliamentary and constitutional democracy in Russia or in China). In a famous article, Hassner shows that we have gone from the world of