Reinhart Koselleck (1923-2006) was one of the most important historians in Germany in the 20th century. Within the German historical scholarship since 1945 he was undoubtedly one of those who has worked most intensively in an interdisciplinary manner and is read across the entire spectrum of the humanities. He had a decisive influence on the history of the term, established the analysis of the political cult of the dead as a research area and has been involved in debates on the politics of memory since the 1990s. Above all, however, he has made innovative and pioneering contributions to the theory of history and the question of 'historical times'. The volume offers a comprehensive overview of Koselleck's entire work, the different subject areas, his way of thinking and asking. The contributions analyse Koselleck's "essayistic history" and show the peculiarity as well as the continuing potential of his historiography.