After completing his studies and PhD in art history, Roh worked as a photographer and art critic. In 1925 he published Nach-Expressionismus: Magischer Realismus: Probleme der neuesten europäischen Malerei (After Expressionism: Magical Realism: Problems of the Newest European Painting), introducing the term “Magical Realism” into modern art criticism. In 1929 he published Foto-Auge (Photo-Eye), a landmark anthology of experimental photography produced with Jan Tschichold. Under the Nazi regime, Roh was placed in protective custody in 1933 and subjected to a publication ban. During the years of internal emigration he worked on Der verkannte Künstler: Geschichte und Theorie des kulturellen Mißverstehens (The Unrecognized Artist: History and Theory of Cultural Misunderstanding), which was published in 1948.