With his novels and novellas, Gottfried Keller is one of the most significant authors of realism. Walter Benjamin ranks him among the "three or four greatest prose writers of the German language" overall. However, Keller stood out not only as a storyteller. He aspired to be a painter and later a playwright, gained initial recognition as a lyricist, engaged in politics, wrote art critiques, and maintained extensive correspondences. This handbook presents Keller's work in its entirety for the first time, taking into account his estate. It reconstructs the author's biography along the locations of Zurich, Munich, Heidelberg, and Berlin, situating his work within the cultural and political context of the time. In light of its historical impact, Keller is also recognized as a pioneer of modernity. The new edition features numerous illustrations for the first time.