After the death of Heinrich Scholz, he was elected
Mayor of Danzig on 2 February 1919, and after the establishment of the Second Free City of Danzig, he was elected the first president of the Senate, the highest governing and executive body, the equivalent of the
government. While still
mayor, on 24 January 1920, he said goodbye to the German troops of the Danzig garrison. Formally non-partisan, however, he was closer to center-right than left-wing groups. His position was indirectly strengthened by party fragmentation in the
Volkstag, the
Parliament of the Free City of Danzig. In 1919, he participated in talks in
Paris on the future status of the Free City of Danzig. He effectively opposed the plans of transporting General
Józef Haller's army to Poland via Danzig, fearing that the Polish side would strengthen its influence in the city. In 1924, he received the honorary doctorate Technische Hochschule Danzig, in 1928 the
University of Königsberg and in the same year honorary membership in the Senate of the University of Tübingen (Tübingen). In this way, his efforts in maintaining the German character of Danzig were also appreciated. In his activities, he primarily had in mind the interests of the Free City of Danzig, which he clearly expressed during a speech in
Hamburg in October 1927, when he demanded that the authorities of the
Weimar Republic conclude a trade treaty with
Poland. He was active in contacts with foreign countries, his trips were aimed at both fostering the growth of
trade and emphasizing the distinctiveness of the Free City of Danzig. In 1921 and 1930 he paid visits to
Warsaw, in 1929 to
Moscow and
Kharkiv, he participated several dozen times in meetings of the
League of Nations in
Geneva, where he enjoyed the trust of many diplomats. Striving to improve the economic situation of the Free City of Danzig, he tried to maintain and even deepen Danzig's multiple ties with the German state, he sought to increase the independence of the Free City of Danzig and weaken the position of the Republic of Poland in it. On many occasions he emphasized the German character of Danzig. He was, like almost all Danzig
Germans, a supporter of a peaceful revision of the Polish-German border and the incorporation of the Free City of Danzig area into the German state. He maintained good contacts with the German authorities; one of his chancellors, Hans Luther, was his longtime friend. He also cooperated with the German Ministry of Foreign Affairs (Auswärtiges Amt) and its representative office in the Free City of Danzig, especially with the
German Consul General,
Edmund Freiherr von Therman. However, he was against moves bearing the hallmarks of political adventures. He enjoyed great prestige among the Germans in Danzig and in the 1920s he was the most influential politician in Danzig. He was a guarantor of the continuity of the Free City of Danzig political line and the stabilization of the local political scene. He was able to cooperate not only with bourgeois parties, but also with the centre-left Senate. Although on 19 December 1928, he was elected president of the Senate for the third time by the Volkstag, but after the parliamentary elections of 16 November 1930, despite the support of national liberals, he had to resign from his position. His concept of a cross-party president was not accepted by, among others, the
Nazi Party, and he did not receive support for his plans to strengthen the president's position from other political parties sitting in the Volkstag. He did not accept the offer to become a senator in the Free City of Danzig. == Mayor of Berlin ==