Wagner, Otto (ôtˈō vägˈnər) [key], 1841–1918, Austrian architect. A structural rationalism was exhibited in his stations for the Vienna city railroad, built in the 1890s. His later works, showing an individual and monumental style, include the Vienna Postal Savings Building and the Steinhof Church (1906). He became a professor at the Imperial Academy of Art in 1894. His many executed designs, his projects, his teaching, and his Moderne Architektur, of which there were four editions (1896–1914), were all widely influential both in Austria and abroad.