Legal and military service

In June 1929 he served as deputy judge of local court in Stuttgart and Tübingen, prior to an intermittent leave of absence from civil service, which allowed him, from 1930 to 1933, to work as a tax consultant to the administration of the diocese of Rottenburg. In 1933, Müller returned to the civil service and served as judge of local courts in different Württemberg towns. Although he never became a member of the Nazi Party, he joined a number of Nazi organizations, such as the Association of German National Socialist legal Professionals.^[4]

On 9 November 1938 the so-called Kristallnacht, Müller filed charges against a Landrat (district chief executive), who had refused fire brigade operation at the burning Göppingen synagoge, he was transferred to the Stuttgart district court. Shortly before the start of World War II Müller was drafted and took part in the campaign in France as a camp office clerk.^[3]

Political career and head of the Constitutional Court

After the war, Müller became the leader of the CDU in the provisional state of Württemberg-Hohenzollern in 1947, and soon won a seat to the assembly, situated in Bebenhausen Abbey. He thus came to head the state government from 1948, as the CDU dominated the elections in 1946 (with 42 seats out of 68).^[3]

As Minister President, Müller signed the last death warrant executed in Germany (other than in East Germany and West Berlin, which had its own legal framework) of murderer Richard Schuh, who was beheaded on 18 February 1949. Müller, a proponent of capital punishment, did not relent even as the constitution of Germany enacted later the same year outlawed capital punishment in the entire federal republic. The penalty remained formally on the books in the state for years after.^[3]

Upon the joining of Baden and Württemberg into the significantly larger state of Baden-Württemberg in 1952, Müller's CDU became the predominant party and he replaced liberal Reinhold Maier as the Minister President. Müller retained this post until he returned to his legal career as he was appointed to head the Federal Constitutional Court, now placed relatively close in Karlsruhe. He kept this office for a full tenure of 12 years and subsequently retired. He lived long enough to witness the collapse of the Berlin Wall in 1989, dying barely two months before reunification in 1990.^[2]