Born Johann Georg Maximillian Blum, he was a son of Robert Blum, and was educated in the universities of Leipzig and Bern, sat in the North GermanReichstag 1867–1870, and was a barrister in Leipzig 1869–1897. In the Franco-Prussian War he served in the field as correspondent for Daheim and edited the Grenzboten from 1871 to 1879. He wrote extensively on contemporary politics and among his works are Die Lügen unserer Socialdemokratie (The lies of our social democracy; 1891), Fürst Bismarck und seine Zeit (Prince Bismarck and his times; 1894–1895), Das erste Vierteljahrhundert des deutschen Reichs (The first quarter century of the German Empire; 1896), Persönliche Erinnerungen an den Fürsten Bismarck (Personal recollections of Prince Bismarck; 1910), Aus dem tollen Jahr (dealing with the revolution of 1848; 1901), dramas, short stories and novels, of which Bernhard von Weimar is the most remarkable.
Hans Blum married Anna Fischer 8 August 1865 in Reinfelden, Germany. They had five children; Gertrude, Adele, Kurt, Walter, and Anna.