Adolf Franz Karl Viktor Maria Loos was an Austrian and Czechoslovak architect, influential European theorist, and a polemicist of modern architecture. He was inspired by modernism and a widely-known critic of the Art Nouveau movement. His controversial views and literary contributions sparked the establishment of the Vienna Secession movement and postmodernism.

Modern architecture, also called modernist architecture, was an architectural movement and style that was prominent in the 20th century, between the earlier Art Deco and later postmodern movements. Modern architecture was based upon new and innovative technologies of construction ; the principle functionalism ; an embrace of minimalism; and a rejection of ornament.