Ralph Gustav Dahrendorf , Baron Dahrendorf , KBE , FBA , PhD ( 1 May 1929 -- 17 June 2009 ) was a German-British sociologist , philosopher , political scientist and liberal politician .
Ralph Gustav Dahrendorf , Baron Dahrendorf , KBE , FBA ( 1 May 1929 -- 17 June 2009 ) was a German-British sociologist , philosopher , political scientist and liberal politician .