Management Board

Learn more about the members of Uniper's Management Board.

Tasks of the Management Board

The Management Board of Uniper SE manages the Company under its own responsibility in accordance with the law, the provisions of corporate by-laws and the rules of procedure for the Management Board and the Supervisory Board as well as the resolutions of the general meeting of shareholders. The Management Board represents the Company vis-á-vis third parties. It manages the business of the company with all its members bearing joint responsibility for its decisions.

The Management Board determines and updates business objectives, fundamental strategic orientation, corporate policy and group organization. This includes, in particular, supervision of the Group and its financial resources, the development of the human resources strategy, appointments to management positions within the Group and leadership development as well as representation of the Group to capital markets and the general public. In addition, it is responsible for the coordination and monitoring of operations in accordance with the established Group strategy.

The Management Board is appointed by the Supervisory Board and reports regularly, comprehensively and in a timely manner to the Supervisory Board on all relevant issues relating to corporate planning, business development, compliance, risk exposure, and risk management. 

Management Board

More about Uniper's corporate governance:

Statutes and Rules of Procedure
Supervisory Board
Corporate Governance

Members of the Management Board

Effective 1 November 2025, the Management Board consists of Michael D. Lewis, the Chief Executive Officer (CEO) and Chief Sustainability Officer (CSO); Christian Barr, the Chief Financial Officer (CFO); Holger Kreetz, the Chief Operating Officer (COO); and Fabienne Twelemann, the Chief People & Transformation Officer (CPTO) and Labour Director.
 

During the interim period, Michael D. Lewis, the Chief Executive Officer will also assume the responsibilities of the Chief Commercial Officer (CCO) until a successor is duly appointed.

Michael D. Lewis

Chief Executive Officer (CEO) since 1 June 2023
Chief Commercial Officer (CCO) until a successor is duly appointed

Michael Lewis

Born 1967    
1985 - 1989 Leicester Polytechnic, UK BEng (Hons) Engineering Technology (IIi)
1989 - 1990 University of Manchester, UK MSc Pollution and Environmental Control
1993 - 1996 De Montfort University, Leicester, UK MA Environmental Law
1990 - 1991 EIA Centre, University of Manchester, UK Research Assistant
1991 - 1993 Wessex Water Plc, UK Environmental Scientist
1993 - 1999 PowerGen plc, UK Environmental Specialist
1999 - 2001 PowerGen plc, UK Strategy Analyst
2002 - 2004 PowerGen plc, UK UK Strategy Manager
2004 - 2007 E.ON AG, Düsseldorf, Germany Vice President, Corporate Strategy
2007 - 2015 E.ON Climate & Renewables GmbH, Essen, Germany Chief Operating Officer (COO)
2010 - 2017 European Wind Energy Association (EWEA), Brussels, Belgium Member of the Board
2012 - 2017 E.ON Energy Research Centre, RWTH Aachen University, Germany Member of the Advisory Board
2015 - 2017 E.ON Climate & Renewables GmbH, Essen, Germany Chief Executive Officer (CEO)
2017 - 2023 E.ON UK plc, Coventry, UK Chief Executive Officer (CEO)
Since 2023 Uniper SE, Düsseldorf, Germany Chief Executive Officer (CEO), Chief Sustainability Officer (CSO)

Christian Barr

Chief Financial Officer (CFO) since 1 November 2025

Christian Barr

Born 1971    
1993 – 1998 University of Hanover, Germany Degree in Economics: Diplom-Ökonom (equivalent to Master’s in Economics)
1998 – 2000 PreussenElektra, Hanover, Germany Investment Controlling 
2000 – 2002 E.ON Energie AG, Munich, Germany Investment Controlling 
2002 – 2003 EW Wesertal, Hameln, Germany Head of Business Development
2002 – 2004 E.ON Energie AG, Munich, Germany Mergers & Acquisitions Specialist
2004 – 2008 E.ON AG, Düsseldorf, Germany Head (VP) Controlling Continental Europe & Generation
2008 – 2012 E.ON Energie AG, Munich, Germany Division Head (SVP) Controlling & Accounting
2012 E.ON Deutschland (E.ON SE), Essen, Germany Division Head (SVP) Controlling
2013 – 2018 E.ON Energie Deutschland GmbH, Munich, Germany Managing Director (CFO)
2018 – 2023 E.ON UK plc, Coventry, UK Member of the Board (CFO)
2023 – 2025 Lechwerke AG, Augsburg, Germany Member of the Board (CFO)
Since 2025 Uniper SE, Düsseldorf, Germany Chief Financial Officer (CFO)

Holger Kreetz

Chief Operating Officer since 1 March 2023

Holger Kreetz

Born 1970    
1991 – 1997 TU, Berlin, Germany Dipl.-Ing. (Masters) in Energy and process engineering
1998 – 2001 Australian National University, Canberra, Australia PhD in Engineering
2001 – 2006 E.ON Energy Projects GmbH, Munich, Germany   Senior Project Executive 
2006 – 2007 E.ON Energie AG, Munich, Germany; Ankara, Turkey   Project Manager
2007 – 2010 E.ON AG, Düsseldorf, Germany   Vice President New Build
2010 – 2011 E.ON New Build & Technology, Gelsenkirchen, Germany; Ratcliffe, UK   Division Head Business and Project Development
2011 – 2013 E.ON Turkey A.S, Istanbul, Turkey   Managing Director
2013 – 2016 EnerjiSA A.S. Istanbul, Turkey Chief Operating Officer
2016 – 2023 Uniper, Düsseldorf, Germany   Chief Operating Officer Asset Management
Since 2023 Uniper, Düsseldorf, Germany   Chief Operating Officer (COO)

 

Fabienne Twelemann

Chief  People & Transformation Officer (CPTO) and Labour Director since 1 November 2025

Fabienne Twelemann

Born 1980         
2000 – 2006 Leibniz University Hanover & University of Bonn, Germany Magister Artium (M.A.), Political Science, Modern History, Business Administration
2002 – 2007 E.ON SE, Düsseldorf, Germany Several roles in Press Department
2007 – 2010 E.ON SE Corporate Media Manager
2010 – 2011 E.ON SE Internal Communications Manager
2011 – 2012 E.ON SE PMO "E.ON 2.0" Efficiency and Restructuring Program
2012 – 2014 E.ON SE Press Spokesperson
2014 – 2015 E.ON SE Spinoff Project Uniper/E.ON "One2two"  
2016 Uniper SE, Düsseldorf, Germany Senior Vice President Internal Communications & Corporate Media 
2017 – 2019 Uniper SE Senior Vice President Corporate Messages & Internal Communications 
2019 – 2021 Uniper SE Senior Vice President Decarbonization Projects: Green Customer & Energy Efficiency 
2021 – 2024 Uniper SE Executive Vice President Corporate Communication & Governmental Relations 
2024 – 2025 Uniper SE Executive Vice President HR & Procurator 
Since 2025 Uniper SE Chief People & Transformation Officer (CPTO) & Labour Director