Emminger worked after graduation as a lawyer in Augsburg and Nuremberg. From 1909 he worked in Augsburg as a magistrate and prosecutor. 1913 drew a Emminger for the Centre Party in the Reichstag. In 1918 he became a member of the BVP, which he represented from 1920 to 1933 in the Reichstag. In the Weimar Republic of the proponents of the death penalty officiated in the Cabinet Marx I as Minister of Justice of 30 November 1923 to 15 April 1924.
During his tenure, judicial reform, the so-called " Emminger - novels " which related to litigation was: (. RGBl. I 135ff ) Regulation on the procedure in civil disputes from February 13, 1924 altered the Code of Civil Procedure and the Regulation on Judiciary and Criminal Justice January 4 ( RGBl. I 15ff. ) the Code of Criminal Procedure and the GVG, which among other things, the Assize old form was abolished (separation of judge and jury with separation of criminal and guilt ) and in place of the single judge bench three professional judges and six jurors entered. Emminger resigned because the center in Bavaria wanted to set up their own, competing with the BVP candidates for the Reichstag.
After the seizure of power by the National Socialists to Emminger withdrew from politics. However, he served more as a judge of the Supreme District Court of Munich ( since 1935 Court of Appeal ); 1946-1949 he was the President of the Senate. His son, Otmar Emminger was president of the Bundesbank.
Emminger was a member of the Catholic Student Association Askania (now K.St.V. Askania Burgundia Berlin) in CT.