Born in 1909, Ehm started his career as a photographer in different practices and studios in Prague. From 1934 he became Professor at the State School of Graphic Arts in Prague. Between 1939 ad 1941 he was co-editor of Photographic Horizons, with Funke. His work was greatly influenced by Albert Renger-Patzsch and May Ray. From 1943 his photographic style focussed on modern Czech subjects. He became a leading representative of the New Objectivity movement and in 1947 a member of the Union of Czech Creative Artistis. From 1960 he went back to teaching again at the State School of Graphic Arts until 1967. In 1970s he continued to work as a freelance photographer, capturing Czech landscapes and Prague interiors.