Stephan Weil (born 15 December 1958) is a German politician and the leader of the Social Democratic Party in Lower Saxony. On 20 January 2013, the SPD and the Green party won the 2013 Lower Saxony state election by one seat. On 19 February 2013, he was elected Prime Minister of Lower Saxony with the votes of SPD and Alliance '90/The Greens.He has been President of the German Bundesrat since November 2013.