FILE - In this March 22, 1998 file picture Lord Ralf Dahrendorf, Goethe-Medal-Prize winner 1998, presents his distinction document after the awarding ceremony in Weimar, eastern Germany. A Berlin research center said Thursday June 18, 2009 that German-British sociologist Ralf Dahrendorf has died. He was 80 years old. The Social Science Research Center in Berlin, where Dahrendorf was a research professor, said he died Wednesday evening in a university clinic in Cologne. Born in Hamburg in 1929, Dahrendorf taught at numerous schools and universities in Britain and Germany. He took British nationality in 1988 and was knighted in 1993. (AP Photo/Jens Meyer,File)