In 1893, Simons became
Amtsgerichtsrat (judge) at Velbert. From 1897 to 1905, he was
Landgerichtsrat at the
Gemeinschaftliche Landgericht of
Thuringia at
Meiningen. In 1905, he went to Kiel where he worked at the
Oberlandesgericht, but left that same year to work as a clerk at the
Reichsjustizamt at Berlin. In 1907, Simons was promoted to
Geheimer Regierungsrat and
Vortragender Rat, responsible for international law. He represented the Reich at several international conferences and in 1911 moved to the
Auswärtige Amt (Foreign Office) where he became
Geheimer Legationsrat and
Justitiar. In 1917, he was promoted to
Wirklicher Geheimer Rat and in 1918 participated in the
negotiations at Brest-Litovsk. On 15 October 1918, shortly before the
German Revolution of 1918-19, chancellor
Max von Baden made him advisor to the
Reichskanzler on issues of international law. He was close to the chancellor and was an important influence on the reform of the
German constitution of 1871 known as the
Oktoberreformen which strengthened the position of the
Reichstag. He also worked on plans to have
Wilhelm II resign in favour of a relative and participated in negotiations at the
Reichsamt des Innern (Interior Ministry) about a new constitution. In November 1918, Simons became
Ministerialdirektor and head of the law department at the Foreign Office. In 1919, as a close staff member of Foreign Minister
Ulrich von Brockdorff-Rantzau he was
Unterstaatssekretär and
Generalkommissar of the German delegation at
Versailles. Since he opposed German signature of the Treaty, Simons resigned his post (
einstweiliger Ruhestand) and became managing director of the
Reichsverband der deutschen Industrie (the industrialists' association). In 1920, he resigned from the
Pan-German League where he had served on the executive board in 1903–1907. ==Political career==