Ullrich Sierau is a German businessperson who has been at the helm of 6 different companies. Currently, he occupies the position of Chairman-Supervisory Board for Dortmunder Stadtwerke Holding GmbH, Chairman-Supervisory Board of Sparkasse Dortmund and Chairman-Supervisory Board for KEB Holding AG.

He is also on the board of 5 other companies.

In the past Ullrich Sierau occupied the position of Chairman-Supervisory Board of Klinikum Dortmund gGmbH, Manager & Head-Planning & Urban Development at City of Dortmund Chairman-Supervisory Board of Dortmunder Stadtwerke AG and Chairman-Supervisory Board for Dortmunder Energie- und Wasserversorgung GmbH (both are subsidiaries of City of Dortmund) and Director-State & Urban Development Research at State of North Rhine-Westphalia.