Wolfgang Spohn is an eminent figure in contemporary analytic philosophy. Though best known for his seminal work in formal epistemology, in particular for the inception and development of ranking theory, his philosophical interests are much broader, covering virtually all parts of theoretical philosophy. This collection of essays from colleagues, friends and former students reflects the wide variety of Spohns philosophical interests. It contains articles on epistemology (e.g., the nature of knowledge and belief, ranking theory, formal theories of belief and its revision), theory of science (e.g., causality, induction, laws of nature), philosophy of language (e.g., theories of meaning, the semantics of counterfactuals) and philosophy of mind (e.g., intentionality, intuitions, free will) as well as on logic, ontology and game theory. The authors: Ansgar Beckermann, Wolfgang Benkewitz, Bernd Buldt, Ralf Busse, Christoph Fehige, Wolfgang Freitag, Gordian Haas, Volker Halbach, Franz Huber, Andreas Kemmerling, Manfred Kupffer, Hannes Leitgeb, Godehard Link, Arthur Merin, Thomas Müller, Julian Nida-Rümelin, Martine Nida-Rümelin, Hans Rott, Holger Sturm, Thomas Ede Zimmermann and Alexandra Zinke.