After graduating from university, he worked in the Austrian Chancellery, 1959 to 1962 in the Austrian delegation of the Organization for Economic Cooperation and Development in Paris, 1962 in the Austrian Embassy in the United States, 1966 as the director of the Economic Liaison Office of the Embassy, and later returned to China to work in the Austrian Chancellery, and 65433 served as the Austrian Consul General in Los Angeles from/kloc. 1982 to 1987, as Austrian ambassador to the United States and ambassador to the Organization of American States; 1987 to 1992 as secretary-general of the Austrian Ministry of foreign affairs; From 1992, he became president, effective from July 8, 2002. 36636.88866868667

On July 5th, 2004, klestil was rushed to Vienna Central Hospital for treatment due to cardiac arrest caused by the recurrence of pneumonia. Austrian Chancellor schuessel temporarily acted as president. On July 6th, klestil died of illness.