Supervisory Board

Christian Specht
Chairman of Supervisory Board, Lord High Mayor of City of Mannheim, Supervisory Board member since 2005 (Picture: © City of Mannheim)

Born in Mannheim in 1966

Career

since 8/2023Lord High Mayor of City of Mannheim
2007 - 2023First Mayor of City of Mannheim
Finance, public holdings, safety and public order, IT
since 3/2005Mayor of City of Mannheim (election as alderman for finance, housing, urban renewal, energy and water supply and public transport)
2001Appointment as Director of Regional Planning Association Rhine-Neckar
1997 - 2002Various positions (assistant, senior administrative director), Regional Planning Association Lower Neckar, Rhenish Pfalz Planning Consortium

 

Education / training

1985 - 1997Study of law and political sciences, University of Mannheim and Ruprecht-Karls-University Heidelberg

 

Positions held on other statutory supervisory boards of German companies

  • GBG Unternehmensgruppe GmbH, Mannheim (Chairman)
  • Universitätsklinikum Mannheim GmbH, Mannheim  

 

Membership of comparable German and foreign company supervisory boards

  • GBG Wohnen GmbH, Mannheim (Chairman)
  • mg: mannheimer gründungszentren gmbh, Mannheim (Chairman)
  • MKB Mannheimer Kommunal-Beteiligungen GmbH, Mannheim (Chairman)
  • MWS Projektentwicklungsgesellschaft mbH, Mannheim (Chairman)
  • Sparkasse Rhein Neckar Nord, Mannheim (Chairman)
  • Stadtmarketing Mannheim GmbH, Mannheim (Deputy Chairman)
  • Verkehrsverbund Rhein-Neckar GmbH (VRN), Mannheim (Chairman)
  • Veranstaltungen - Tourismus - Marketing: Mannheim erleben GmbH (Chairman)

 

Status: 13 March 2026

Heike Kamradt-Weidner*
Deputy Chair of Supervisory Board, Chair of MVV Group Works Council, Supervisory Board member since 2012

Born in Mannheim in 1969

Career

since 2025Honorary judge at the Baden-Württemberg Regional Labor Court, Mannheim Chamber
since 2017Chair of MVV Group Works Council / Deputy Chair of Supervisory Board of MVV Energie AG, Mannheim
since 2017Unsalaried judge at Mannheim Labour Court
since 2010Member of Works Council (released from other duties) of MVV Energie AG, Mannheim
1987 - 2010Various positions in sales, MVV Energie AG, Mannheim;
Most recently deputy head of department, private customer sales / team leader for customer management

 

Education / training

2011Mediator, Wismar Technical College
1984 - 1987Training as legal assistant, Mannheim

 

Positions held on other statutory supervisory boards of German companies

  • MVV Netze GmbH, Mannheim

 

Membership of comparable German and foreign company supervisory boards

  • Soluvia Energy Services GmbH, Offenbach
  • MVV Enamic GmbH, Mannheim
  • MVV Trading GmbH, Mannheim
  • Soluvia IT Services GmbH , Kiel

 

Status: 30 January 2026

Kathrin Biro*
Trade union secretary, Managing Director of ver.di Rhine-Neckar district, member of the Supervisory Board since 2023

born in Karlsruhe in 1987

Career

since 2023Managing Director ver.di Rhine-Neckar
2020Deputy Managing Director ver.di Rhine-Neckar
2014 - 2020Trade union secretary in the regional department for health, social services, education and science
2013 - 2014Training as trade union secretary ver.di
2009 - 2012Trainer for chemical laboratory assistants at the Karlsruhe Institute of Technology
2008 - 2009Laboratory coordinator at the Institute of Chemical Technology at the Frauenhofer Gesellschaft

 

Education

2005 – 2008Training as a chemical laboratory assistant at the Karlsruhe Research Center

 

Status: 30 January 2026

Angelo Bonelli*
Trade Union Secretary ver.di Rhine-Neckar, Supervisory Board member since 2022

Born in Mannheim in 1975

Career

since 2010Trade Union Secretary, Division 2, Utilities and Disposal Sector in Rhine-Neckar District, State Division Baden-Württemberg and Mittelbaden-Nordschwarzwald and Division 9, Telecommunications/IT in Rhine District minus Neckar
2007 - 2010Chair of Works Council and Deputy Chair of General Works Council at Deutsche Telekom Kundenservice GmbH, Bonn
1998 - 2007Chair of Works Council (released from other duties) at T-Mobile Deutschland GmbH, Mannheim
1997 - 1998Commercial employee in customer service at T-Mobile Deutschland GmbH, Mannheim, member of Works Council

 

Education

1993 - 1996Training as wholesale and export merchant at Thyssen Schulte GmbH, Mannheim

Positions held on other statutory supervisory boards of German companies

  • TransnetBW GmbH, Stuttgart

     

Status: 13 March2026 

Sabine U. Dietrich
Supervisory Board Member, Consultant, Supervisory Board member since 2020

Born in Munich in 1960

Career

2012 - 2015Board Director at BP Europe SE, Bochum
2010 - 2011Director Safety & Operational Risk, Head of HSSEQ, Head of Ethics & Compliance,
bp Europa SE, Bochum
2005 - 2010Vice President Operations, Remediation Management EMEA & Asia Pacific
bp plc., London/UK
2005Innovation Project Leader “Refining & Marketing” India
bp plc., Mumbai/India
1999 - 2004Various roles in Commercial, Asset, and M&A Integration departments
in Germany/Austria/Switzerland
bp Europe
1997 - 1999Business Development Manager Vietnam
bp plc., Ho Chi Minh City, Vietnam
1991 - 1997Various European management roles (including Business Improvement, People Task Force, Project Engineer)
bp Europe, Brussels/Belgium
1989 - 1990Product Planner & Project Management
Steigenberger Hotels, Frankfurt

 

Education / training

1992Registration as architect with Chamber of Architects, Berlin
1984 - 1989Study of engineering, majoring in construction/architecture TU Berlin
1978 - 1982A-levels (“Abitur”), evening class
Schule für Erwachsenenbildung SfE, Berlin
1976 - 1978Commercial training (clerical qualification) Isaria Reisen, Munich

Positions held on other statutory supervisory boards of German companies

  • Commerzbank AG, Frankfurt am Main

 

Status: 30 January 2026

Detlef Falk*
Chairman of Works Council of Stadtwerke Kiel AG, Supervisory Board member since 2007

Born in Kiel in 1964

Career

since 2012Deputy Chairman of MVV Group Works Council
since 2011Chairman of Works Council of Stadtwerke Kiel AG, Kiel
2007Deputy Chairman of Works Council of Stadtwerke Kiel AG, Kiel
2006Member of Works Council (released from other duties) of Stadtwerke Kiel AG, Kiel
1995 - 2006Construction manager, strategy and controlling, district heating systems and grids, Stadtwerke Kiel AG, Kiel
1989 - 1995Specialist worker, district heating systems and grids, Stadtwerke Kiel AG, Kiel

 

Education / training

1990Recognised qualification as “Industry Master Tradesman – Metal Specialism”
1982 - 1989Training as machinist, Stadtwerke Kiel AG, Kiel

 

Positions held on other statutory supervisory boards of German companies

  • Stadtwerke Kiel AG, Kiel (Deputy Chairman)

     

Membership of comparable German and foreign company supervisory boards

  • Soluvia Energy Services GmbH, Offenbach
  • Soluvia IT-Services GmbH, Kiel

 

Status: 30 January 2026

Manuel Gellenthin*
Managing Director of ver.di district Kiel‑Plön, Supervisory Board member since 2026

Born in 1981 in Schwerin

Professional Career

Since 09/2011Trade Union Secretary, Head of Youth Division, ver.di Regional District North
04/2010 – 08/2021Nord Youth Education Officer, ver.di, Regional District North
09/2008 – 03/2010Trade Union Secretary, Youth Division, ver.di District Neubrandenburg–Greifswald
08/2004 – 08/2008Enforcement and Execution Officer, District of Ludwigslust

 

Ausbildung

09/2021
Qualified Office Administrator and Administrative Specialist, District of Ludwigslust

 

Positions held on other statutory supervisory boards of German companies

  • HanseWerk AG, Quickborn

 

Status: 13 March 2026

Raphaela Haring*
Head of Diversity and Prevention, Supervisory Board member since 2026

Born in 1981 in Wagna, Austria

 

Professional Career 

Since 2025Head of Diversity and Prevention, MVV Energie AG, Mannheim
2021 - 2025Head of Staff Department for Diversity and Prevention, MVV Energie AG, Mannheim
2017 – 2021Head of Human Resources, Rockwell Collins Deutschland GmbH, a part of Collins Aerospace, Heidelberg
2017Head of Human Resources, Kompetenzzentrum - Das virtuelle Fahrzeug Forschungsgesellschaft mbH, Graz, Austria
2012 – 2016Team Lead, Ranorex GmbH, Graz, Austria
2009 – 2012Departmental Coordinator and Project Associate, Graz University of Technology, Graz, Austria

 

Ausbildung

2001 – 2008 Master’s degree in German Studies, University of Graz (Karl‑Franzens‑Universität Graz), Austria, and Bristol University, United Kingdom
1999 – 2001Diploma programme at the Commercial Academy (Handelsakademie) Monsbergergasse, Graz, Austria

 

Positions held on other statutory supervisory boards of German companies

  • Energieversorgung Offenbach AG, Offenbach

     

Membership of comparable German and foreign company supervisory boards

  • MVV Enamic GmbH, Mannheim

     

Status: 13 March 2026

Martin F. Herrmann
Business Angel and Mentor, Supervisory Board member since 2021

Born in Düsseldorf in 1967

Career

since 2020Business angel & mentor
Support for international start-ups 
2022 - 2025Chairman of the Supervisory Board, Česká pošta, s.p., Prague, Czech Republic
2016 - 2019COO Retail, Executive Board member, innogy SE, Essen, Germany
2012 - 2019CEO, innogy Česká republika a.s. (until 9/2016: RWE Česká republika a.s.),
Prague, Czech Republic
2013 - 2019CEO, innogy Grid Holding, a.s. (until 9/2016: RWE Grid Holding, a.s.),
Prague, Czech Republic
2010 - 2016CEO, RWE East, s.r.o., Prague, Czech Republic
2007 - 2013CEO, RWE Transgas, a.s. (since 1/2013: RWE Supply & Trading CZ, a.s.),
Prague, Czech Republic
2004 - 2007CFO, Deputy CEO, RWE Transgas, a.s. (until 4/2005 Transgas, a.s.),
Prague, Czech Republic
2002 - 2004CFO, Executive Board member, Transgas, a.s., Prague, Czech Republic
2001 - 2002Vice President, Head of Industry Group Utilities, Commerzbank AG,
Frankfurt am Main, Germany
2000 - 2001Project Manager, M&A, Commerzbank AG, Frankfurt am Main, Germany
1995 - 1999Head of Investment Banking department, Commerzbank AG, Prague Office,
Prague, Czech Republic
1994 - 1995Project Manager Relationship Management Central & Eastern Europe,
Commerzbank AG, Frankfurt am Main, Germany & Prague, Czech Republic
1993 - 1994Trainee, Relationship Management Central & Eastern Europe Commerzbank AG,
Frankfurt am Main, Germany & Prague, Czech Republic

 

Education / training

1988 - 1993Study of economics (Dipl.-Volkswirt), Westfälische Wilhelms-Universität,
Münster, Germany
1986 - 1988Bank traineeship, Dresdner Bank AG, Duisburg Branch, Duisburg, Germany;
qualification as bank clerk

 

Status: 30 January 2026

Gregor Kurth
Igneo Infrastructure Partners (Igneo), London, UK; Member of the Supervisory Board since 2020

Born in Cologne in 1981

Career

since October 2020Partner, Infrastructure Investments, Igneo Infrastructure Partners, London, Great Britain
since 2019Head of Transactions, Infrastructure Investments, Igneo Infrastructure Partners, Great Britain
2015 - 2019Director, Infrastructure Investments, Igneo Infrastructure Partners, Great Britain
2013 - 2015Associate Director, Infrastructure Investments, Igneo Infrastructure Partners, Great Britain
2010 - 2013Senior Executive, Infrastructure Investments, Igneo Infrastructure Partners, Great Britain
2008 - 2009Investment Analyst, 3i Group plc., Frankfurt
2006 - 2008Analyst, Deutsche Bank AG, Frankfurt

 

Education / training

2005 - 2006Master of Science (M.Sc.) in International Accounting and Finance, Sir John Cass Business School, Great Britain
2002 - 2005Bachelor of Science (B.Sc.) in International Business Economics, University of Maastricht, Netherlands

 

Membership of comparable German and foreign company supervisory boards

  • Owlcasle Holdings Limited, London, Great Britain
  • westconnect GmbH, Essen, Germany
  • terralayr AG, Zug, Schweiz

 

Status: 30 January 2026

Thoralf Lingnau*
Member of Works Council MVV Energie AG, Supervisory Board Member since 2020

Born in Stralsund in 1965

Career

since 2018Works Council member (released from other duties), MVV Energie AG, Mannheim
2010 - 2018Organisation manager, MVV Energie AG, Mannheim
2006 - 2010Controller, MVV Energie AG, Mannheim
1991 - 2006Project manager, project controller for major projects, MVV Energie AG, Mannheim

 

Education / training

2006 - 2007Horvath Akademie, Horvath Diploma in Controlling
1996Rationalisierungs-Kuratorium der Deutschen Wirtschaft e.V., Project management specialist
1986 - 1991Ingenieurhochschule für Seefahrt Warnemünde/Wustrow, graduate in engineering
1981 - 1983Rostock Vocational Training Centre, training as merchant navy sailor

 

Membership in comparable domestic and foreign supervisory bodies of commercial enterprises

  • MVV Enamic GmbH, Mannheim

 

Status: 30 January 2026

Dr. Lorenz Näger
Former Deputy Chairman of the Board of Management and Chief Financial Officer of HeidelbergCement AG (now Heidelberg Materials AG), Supervisory Board member since 2011

Born in Ravensburg in 1960

Career

2020 - 08/2021Deputy Chairman of the Board of Management and Chief Financial Officer of HeidelbergCement AG, Heidelberg
2004 - 2020Member of Executive Board & Chief Financial Officer of HeidelbergCement AG, Heidelberg
1999 - 2004Member of Executive Board of PHOENIX Pharmahandel AG, Mannheim
1997 - 1999Managing Director of PHOENIX International Beteiligungs GmbH, Mannheim
1993 - 1997Head of Corporate Development, PHOENIX Pharmahandel, Mannheim
1991 - 1993Head of tax department, Ferd. Schulze GmbH, Mannheim
1988 - 1991Assistant at Institute of General Business Administration and Corporate Taxation, University of Mannheim
1987 - 1988Audit Assistant, Dr. Lipfert GmbH Wirtschaftsprüfungs- und Steuerberatungsgesellschaft, Stuttgart

 

Education / training

1991Doctorate and professional qualification as tax advisor
1981 - 1986Study of business administration, Universities of Regensburg, Swansea (Wales) and Mannheim

 

Positions held on other statutory supervisory boards of German companies

  • PHOENIX Pharma SE, Mannheim

  • Blanc & Fischer Familienholding SE & Co.KGaA, Oberderdingen

     

Membership of comparable German and foreign company supervisory boards

  • PHOENIX Pharma-Handel GmbH & Co. KG, Mannheim

 

Status: 30 January 2026

Alexandros Nassuphis
Managing Director bei Igneo Infrastructure Partners, London, UK, Supervisory Board member since 2025

Born in Athens, Greece, in 1969

Career

since 2025Member of the Management Board at City Green Light SpA, Vicenza, Italy
since 2019Managing Director at Igneo Infrastructure Partners, London, United Kingdom
2015 - 2019Director at First State Investments, London, United Kingdom
2004 - 2013Managing Director (since 2008) at HSBC, London, United Kingdom
1999 - 2004Director (since 2003) at Dresdner Kleinwort, London, United Kingdom
1998 - 1999Analyst at CSFB, London, United Kingdom
1997 - 1998Associate at AT Kearney, London, United Kingdom

 

Education 

1995 - 1996Alliance Manchester Business School, Manchester/UK, MBA 
1988 - 1995National Technical University of Athens, Athens, Greece, Dipl. Ing. Maschienenbau 

 

Positions held on other statutory supervisory boards of German companies

  • Höegh Evi Ltd., Bermuda
  • Anglian Water Services Limited, United Kingdom
  • Anglian Water Group Limited, Jersey

 

Status: 30 January 2026

Erik Niedenthal*
Chairman of Works Council of EVO AG, Offenbach, Supervisory Board member since 2022

Born in Langen in 1970 

Career

since 2022Chairman of Works Council at Energieversorgung Offenbach AG, Offenbach
2006 - 2022Deputy Chairman of Works Council at Energieversorgung Offenbach AG, Offenbach
2004 - 2006Project Manager, Company Development Department
2003 - 2004Coordination Manager, Company Development Department
2001 - 2003IT Systems & Network Management
1997 - 2001IT / Office Communications / Applications Management Assistant
1991 - 1997Specialist Fitter for Network Cabling, Electrical, Air Conditioning, Ventilation and Management Technology in Metrology and Telecommunications Department

 

Training / Qualifications

1992 - 1996Certified technician and trainer for vocational and work-based training, Darmstadt
1987 - 1991Training as electrical systems fitter / electrical systems electrician, Energieversorgung Offenbach AG, Offenbach

Positions held on other statutory supervisory boards of German companies

  • Energieversorgung Offenbach AG, Offenbach (deputy chairman)

     

Membership of comparable German and foreign company supervisory boards

  • Soluvia Energy Services GmbH, Offenbach
  • Soluvia IT-Services GmbH, Kiel

 

Status: 30 January 2026

Dr. Volker Proffen
Mayor of City of Mannheim, Supervisory Board member since 2023

born in Mannheim in 1978 

Career

since October 2023Mayor of City of Mannheim
2020 – 2023Head of Politics, Südzucker AG, Mannheim
2015 – 2020Sustainability Coordinator, Südzucker AG, Mannheim
2009 – 2015Personal Assistant to the Chairman of the Executive Board, Südzucker AG, Mannheim
2007 – 2009Consultant Harder BR GmbH, Stuttgart
2003 – 2007Working student and doctoral candidate, Daimler AG, Stuttgart

 

Education

2008Doctorate (Dr. rer.pol.)
2004 – 2008Doctoral programme, EBS Oestrich-Winkel
2002 – 2003Postgraduate programme, EADA Business School, Barcelona
1999 – 2002Dual study programme, DHBW Mannheim / Friatec AG, Mannheim

Positions held on other statutory supervisory boards of German companies

  • Rhein-Neckar-Verkehr GmbH, Mannheim

     

Membership of comparable domestic and foreign supervisory bodies of German companies

  • MKB Mannheimer Kommunalbeteiligungen GmbH, Mannheim (Deputy Chairman)
  • MV Verkehr, Mannheim (Chairman)

 

Status: 30 January 2026

Tatjana Ratzel
Lawyer, Department Manager at INTER Krankenversicherung AG, Mannheim, Supervisory Board member since 2020

Born in Ludwigshafen am Rhein in 1971

Career

since 2013Lawyer, Department Manager at INTER Krankenversicherung AG,
Mannheim
2004Registration as attorney-at-law
since 2002INTER Versicherungsgruppe, Mannheim Head Office
2001 - 2002Vereinte Krankenversicherung AG, Karlsruhe
2000 - 2001Mannheimer Versicherung AG, Mannheim Head Office

 

Education / training

1999Second State Examination in Law, graduation as fully qualified lawyer
1997 - 1999Legal traineeship, Heidelberg District Court
1997First State Examination in Law
1991 - 1996Study of law at Mannheim University

 

Status: 30 January 2026

Andreas Schöniger*
Deputy Chairman of Works Council of MVV Energie AG, Supervisory Board member since 2022

Born in Ludwigshafen am Rhein in 1975

Career

since 2022Deputy Chairman of Works Council of MVV Energie AG, Mannheim
since 2017Member of Works Council (released from other duties) of MVV Energie AG, Mannheim
1996 - 2016System analyst at group companies of MVV Energie AG, Mannheim

 

Education / training

1992 - 1996Apprenticeship as electromechanic, MVV Energie AG, Mannheim (formerly Stadtwerke Mannheim AG)

 

Membership of comparable German and foreign company supervisory bodies

  • MVV Trading GmbH, Mannheim
  • MVV Umwelt GmbH, Mannheim
     

Status: 30 January 2026

Constanze Schuhmacher*
Chair of the Works Council of JUWI GmbH and Chair of the Group Works Council of JUWI GmbH, Supervisory Board member since 2026

geb. 1966 in Klein-Winterheim

Beruflicher Werdegang

Since 10/2022Full‑time Chair of the Works Council of JUWI GmbH and Chair of the Group Works Council of JUWI GmbH 
05/2018 – 10/2022  Full‑time Chair of the Works Council of JUWI AG and Chair of the Group Works Council of JUWI AG 
04/2016 – 04/2018Chair of the Group Works Council of JUWI AG; Full‑time Chair of the Works Council of juwi Energieprojekte GmbH 
10/2015 
Founding Member of the Works Council at JUWI;
Chair of the Works Council of juwi Energieprojekte GmbH

 

Ausbildung

1999 – 2001Kauffrau für IT-Systemmanagement (Intertronic GmbH), Wörrstadt

 

Gesellschaften Positions held on other statutory supervisory boards of German companies

  • Juwi GmbH, Wörrstadt 

     

Status: 13 March 2026

Dr. Melanie Seidenglanz
Project Manager for Labour Market and Education, Metropolregion Rhein-Neckar GmbH, Supervisory Board member since 2025

Born in Mannheim in 1984

Career

since 2021Project Manager for Labour Market and Education, Metropolregion Rhein-Neckar GmbH, Mannheim
2018 - 2021Regional Transfer Manager for Education, Metropolregion Rhein-Neckar GmbH, Mannheim
2014 - 2018Programme Manager and Assistant to the Examination Board, Department of Law, University of Mannheim
2012 - 2014Accreditation Coordinator, Department of Law, University of Mannheim
2010 - 2012Research Associate at the Leibniz Institute for the German Language, Mannheim
2008 - 2010Project Associate, Evaluation Agency Baden-Württemberg, Mannheim


Education

2021 - 2024Part-time Master’s programme in Business Administration & Management (M.A.), TU Kaiserslautern, Kaiserslautern
2014Doctorate (Dr. phil.) at the Faculty of Humanities, University of Mannheim
2003-2008Magister degree programme in German Studies and Political Science at the University of Mannheim and Uppsala Universitet, Sweden

 

Positions held on other statutory supervisory boards of German companies

  • BBS Bau- und Betriebsservice GmbH, Mannheim (Deputy Chair)
  • mg: mannheimer gründungszentren gmbH, Mannheim
  • Veranstaltungen – Tourismus – Marketing : Mannheim erleben GmbH, Mannheim

Status: 30 January 2026

Nina Wellenreuther
Student; Chair of the Parliamentary Group of Die Grünen / Die Partei Mannheim and Member of the Municipal Council of the City of Mannheim, Supervisory Board member since 2026

Born in 1996 

Beruflicher Werdegang

2019 - 2020Project Manager (Interface Management between Editorial, Marketing and Sales), Haas Mediengruppe, Mannheim

 

Ausbildung

since 2025Master’s programme in Environmental Engineering, Darmstadt University of Applied Sciences
2019 - 2025Bachelor’s programme in Environmental Engineering, Darmstadt University of Applied Sciences;
Degree: B.Eng. in Environmental Engineering
2016 - 2019Vocational training as Media Management Clerk, Mannheimer Morgen, Mannheim

 

Membership of comparable German and foreign company supervisory boards

  • MKB Mannheimer Kommunalbeteiligungen GmbH, Mannheim
  • Mannheimer Verkehr GmbH, Mannheim
     

 

Status: 13 March 2026

* representative of the employees

Code of Procedure for the Supervisory Board

Code of Procedure for the Supervisory Board of MVV Energie AG

Status: June 2020

Download