This chapter discusses the life and work of Ernst Jünger, who was part of a strain in modern German conservatism that tested the limits of modernity and Enlightenment rationality. He catapulted to fame as a young man on the basis of his World War I memoirs, In Storms of Steel, which made him part of the antidemocratic forces of the Weimar Republic, but he retreated into the inner emigration during the Third Reich. After 1950 he lived a reclusive life but published a stream of essays and books and an impressive diary that chronicled almost four decades of life with sharp observations on a wide range of topics. He was a cultural pessimist who thought that the rise of a unifying planetary technology and the loss of local culture meant that we were entering into a posthistorical world of fragmentation, and new forms of cultural and political tyranny.