Along with Josef Hoffmann, Oswald Haerdtl is considered the most productive architect of the 20th century in Austria. In the book accompanying the exhibition, several authors explore specific topics related to Oswald Haerdtl's work, such as continuity and internationality, or Haerdtl's role in the network of Austrian modernism. Long overdue, this is the first monograph on Oswald Haerdtl.