Bremen, Böhrnsen was elected President of the German Bundesrat for the year 2009–2010, starting 1 November 2009. This office rotates between the heads of government of the states of Germany following a defined schedule. According to the German constitution, the head of the Bundresrat is the designated substitute for the President of Germany. When Horst Köhler resigned from the presidency on 31 May 2010, Böhrnsen assumed the functions of head of state of Germany until the election of a successor by a Federal Convention. The successor was Christian Wulff, who assumed office upon his election on 30 June 2010. After his party lost more than five percentage points in the state election on 10 May 2015, Böhrnsen retired as head of government. His successor was Carsten Sieling. References External links CityMayors profile |- |- 1949 births Living people Presidents of the German Bundesrat Social Democratic Party of Germany politicians Members of the Bürgerschaft of Bremen Mayors of Bremen Acting heads of state of Germany