Managing Board & Supervisory Board

Chief Executive Officer

Dr.-Ing. Jürgen Reinert

After studying electrical engineering in South Africa, Dr.-Ing. Jürgen Reinert (b. 1968) received his doctorate at the Institute for Power Electronics and Electrical Drives (ISEA) at RWTH Aachen, Germany, and began his career as senior engineer there. From 1999 to 2011, he worked for Emotron AB in Sweden, where in his last position, as General Manager, he was responsible for Technology and Operations. From 2011 to 2014, as Executive Vice President, he was responsible for the division Power Plant Solutions at SMA. Under his leadership, SMA was successful in expanding its worldwide project business and developing turnkey system solutions for large-scale PV power plants. Since April 2014, Dr. Reinert has been a member of the Managing Board. He was appointed Chief Executive Officer in October 2018. With the extension of his contract in July 2023, the Supervisory Board appointed him Chairman of the Managing Board. Dr. Jürgen Reinert is responsible for Strategy, Research & Development, and Communication & Sustainability, and serves as Labor Director of SMA. He is a member of the Supervisory Board at Danfoss A/S.

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Dr.-Ing. Jürgen Reinert (Chief Executive Officer)

Board Member for Finance and Legal

Barbara Gregor

Barbara Gregor (b. 1970) started her career at the thyssenkrupp group after graduating in business management. She held a number of positions in Germany and abroad as well as at the group headquarters (central corporate function of controlling). Between 2002 and 2013, she worked in the group’s stainless steel segment, where she supported the establishment of the Shanghai Krupp Stainless joint venture in Shanghai. Her last role was head of controlling and authorized officer for the thyssenkrupp Stainless International Group. From 2013 to 2015, she was CFO of the apt Hiller Group where she spearheaded international growth and M&A projects. Before joining SMA, Barbara Gregor was CFO of the international operating unit thyssenkrupp Materials Trading and Managing Director (CFO) of thyssenkrupp Materials Trading GmbH, where she was responsible for managing and further developing the areas of Finance, Controlling, Accounting, Risk Management, Human Resources and IT. Since December 1, 2022, Barbara Gregor has been responsible as a member of the SMA Managing Board for Finance, Investor Relations, Real Estate Management, Legal, Governance, Compliance, Risk Management and the Internal Auditing Department.

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Barbara Gregor (Board Member for Finance and Legal)

Board Member for Transformation and Operations

Olaf Heyden

Olaf Heyden (*1963) has a degree in Business Administration and Business Information Technology. He began his career at Dornier GmbH/DASA (now Airbus SE) in 1986. Following his roles at at T-Mobile and Electronic Data Systems (EDS), Olaf Heyden was Senior Vice President Billing & Collection at Deutsche Telekom AG from 2000 to 2004, where he was responsible for group-wide billing and debt collection processes in the Shared Service Center. Until 2011, he was Chief ICTO Officer and member of the Managing Board of T-Systems, overseeing the outsourcing business of data centers, workplace systems, telecommunications networks and business processes. After holding positions as CEO at Freudenberg IT GmbH & Co. KG and as a member of the Managing Board at Wincor Nixdorf AG, he joined Diebold Nixdorf Inc. as Senior Vice President Service in 2016. There, he consolidated and managed the global service business following the acquisition of Wincor Nixdorf by Diebold Inc. Until 2023, Olaf Heyden was responsible as COO and Executive Vice President for the operational functions of Operations, Supply Chain, Service, Software Delivery, R&D, Procurement and IT. Since 2024, he has headed the group-wide transformation and restructuring program at SMA; he has been a member of the Managing Board since February 2025. As part of his role on the Managing Board, Olaf Heyden is also responsible for the areas of Operations, Human Resources and Digitalization.

Supervisory Board of SMA Solar Technology AG

Shareholder Representatives

Kim Fausing (Deputy Chairman)
Constanze Hufenbecher
Alexa Siebert
Uwe Kleinkauf (Chairman)
Ilonka Nussbaumer
Jan-Henrik Supady

Employee Representatives

Martin Breul Oliver Dietzel
Johannes Häde
Yvonne Siebert
Romy Siegert
Dr. Matthias Victor

Mediation committee

Martin Breul
Kim Fausing
Uwe Kleinkauf
Romy Siegert

Presidial committee

Uwe Kleinkauf (Chairman)
Kim Fausing
Yvonne Siebert (Deputy Chairman)
Dr. Matthias Victor

Audit committee

Oliver Dietzel
Johannes Häde
Alexa Siebert (Chairman)
Jan-Henrik Supady (Deputy Chairman)

Nomination committee

Alexa Siebert
Uwe Kleinkauf (Chairman)
Ilonka Nussbaumer (Deputy Chairman)
Jan-Henrik Supady