Otto Wagner was an influential Austrian architect and urban planner, born on July 13, 1841, in Vienna. He is best known for his role in the development of the Vienna Secession movement, which sought to break away from traditional architectural styles. Wagner's designs often featured modern materials like iron and glass, emphasizing functionality and simplicity. One of his most famous works is the Vienna Stadtbahn, a railway system that integrated public transport into the city. Wagner also designed notable buildings such as the Majolikahaus and the Postsparkasse, showcasing his innovative approach to architecture and urban design.