Peter Sloterdijk is a German philosopher, cultural theorist, television host and columnist. He is a professor of philosophy and media theory at the University of Art and Design Karlsruhe. Peter Sloterdijk studied philosophy, Germanistics and history at the University of Munich. In 1975 he received his Ph.D. from the University of Hamburg. Since 1980 he has published many philosophical works, including the Critique of Cynical Reason. In 2001 he was named president of the State Academy of Design, part of the Center for Art and Media in Karlsruhe. In 2002 he began to co-host Das Philosophische Quartett, a show on the German ZDF television channel devoted to discussing key issues affecting present-day society. The Kritik der Zynischen Vernunft (Critique of Cynical Reason), published by Suhrkamp in 1983, became the best-selling philosophical book in the German language since the Second World War and launched Sloterdijk's career as an author. The trilogy Spheres is the philosopher's magnum opus. The first volume was published in 1998, the second in 1999, and the last in 2004.