Career
He has served as the President of the Senate and Mayor of Bremen since 15 July 2015. Between 1996 and 2001, Sieling served on the board of the Bremen Consumer Association. From 1997, he was the chairman of the board.
In this position, he was his parliamentary group’s rapporteur on consumer protection in financial services.
From 2012, he also served as deputy chairman of the German-British Parliamentary Friendship Group. Sieling resigned from his seat in parliament to become President of the Senate and Mayor of Bremen in July 2015, succeeding Jens Böhrnsen.
As one of the state"s representatives at the Bundesrat, he serves on the Committee on Foreign Affairs and on the Committee on Defence. Cultural Foundation of the German States (KdL), Chairman of the Council
IG Metall, Member
ver.di, Member
Haus & Grund Bremen, Chairman of the Board (2009-2012).