German painter, born in Krefeld. A student of Joseph Beuys, he was a leading member, alongside the Czech-born Jiri Georg Doukopil (1954– ), of the Cologne-based Mülheimer Freiheit group of Neo-Expressionist painters in the early 1980s. The two artists frequently worked in collaboration. Generally, Dahn takes a somewhat ironic stance towards the Expressionist manner. His paintings of the early 1980s were influenced by the primitivism of Dubuffet's imagery without any of the French artist's refinement of handling. The style can be close to caricature, the subject-matter can have a grim humour. A smoker's leg is pierced by a burning cigarette, a drinker's head and his bottle change places. In his Ex Voto series of 1987 he adopted Sigmar Polke's technique of painting with dots to depict groups of primitivist carvings.