Grosz was born in Berlin. He was enlisted in 1914 but discharged on medical grounds in 1915. After his time spent in the army, Grosz developed a hatred of the military. As a protest against the campaign of hatred being incited against the enemy, he anglicized his name from 'Georg' in 1917. From 1917 to 1920 he was a prominent member of the Berlin Dada group. Along with Otto Dix, Grosz is the best known of the political artist-satirists who flourished in Germany after the First World War. In the 1920s, both Grosz and Dix were exponents of a new, sobrely realist style, called 'Neue Sachlichkeit', or New Objectivity.