Kerstin Stumpf has served as Deputy Chair of the Executive Board and Chief Technical Officer of Mainzer Stadtwerke since April 1, 2024. After earning a degree in civil engineering from the Technical University of Darmstadt, she joined Mainzer Stadtwerke, initially working as a planning engineer in the drinking water supply division. In early 2001, she took over as head of the Order Planning and Control Department in the maintenance and installation division for the gas, water, electricity, and street lighting sectors. In April 2005, she became Head of the “Technical Planning and Facility Management” Division, overseeing the Technical Planning, Facility Management, and Technical Management departments. Following the founding of the new municipal utility network company Mainzer Netze GmbH in 2011, she was appointed head of the “Network Services and Facility Management” division, which included the departments of Project Management/Engineering for construction projects in the areas of water, electricity, and gas; Technical Documentation; Street Lighting; Facility and Real Estate Management; and Warehousing and Logistics. In early 2018, she initially took over the management of Mainzer Stadtbad GmbH, which operates the Taubertsbergbad swimming pool above Mainz Central Station, before transferring this role internally to Fabienne Hallpap. Since 2024, she has been co-managing Mainzer Stadtwerke AG together with Daniel Gahr.