Voith Turbo Board of Management

Interim CEO of Voith Turbo is Dirk Hoke.

Alexandre Riesterer has been a member of the Management Board of Voith Turbo since January 2024, responsible for Finance and Controlling.

From 2020 to 2023, he served as Global CFO at Faurecia Clarion Electronics Co. in Japan, overseeing financial operations across the USA, Europe, India, Thailand, China, and Japan.

Prior to that, Alexandre Riesterer was CFO and Executive Vice President & Administration at Bosch Corporation in Tokyo from 2018 to 2020, where he was responsible for Finance, Logistics, Indirect Purchasing, HR/IT, as well as Audits, Data Security, and Compliance.

In 2014, he was appointed Global CFO and Senior Vice President Finance & Controlling for the Chassis System Control division at Robert Bosch in Abstatt, Germany. From 2010 to 2014, he served as President and Managing Director of Robert Bosch Automotive Technologies in Rayong, Thailand.

Alexandre Riesterer began his international career with Bosch in 1998, holding various leadership roles including Head of Finance & Controlling in Saitama, Japan (2006–2009), Manager Finance & Controlling for Power Tools in Leinfelden, Germany (2003–2006), and Financial Controller and Assistant to the CEO at the company’s headquarters in Brussels.

He began his professional career in 1993 as a Financial Analyst at Aachener und Münchener Immobilien GmbH in Aachen, Germany. Alexandre Riesterer holds a degree in Economics from the HEC Management School at the University of Liège, Belgium.

Dr. Ralf Geßlein has been a member of the Management Board of Voith Turbo since May 2022 and leads the Industry Division.

Previously, as CEO, he was responsible for Siemens’ global wind generator business, which he integrated into the Flender Group in 2020 and continued to lead successfully.

Since 2005, he held various leadership roles at Siemens, including Vice President Product Management Large Drives Industry, Senior Vice President Drive Systems, and Executive Vice President Oil & Gas and Process Industries.

Dr. Ralf Geßlein studied electrical engineering with a focus on power engineering at the University of the Federal Armed Forces in Munich and earned a doctorate in control engineering.

Müslüm Yakisan, CEO Voith Turbo Rail & Marine, has been a member of the Voith Turbo Management Board since the end of 2025. In this role, he is responsible for the strategic development, operational management, and sustainable growth of our mobility and marine technologies.

Mr. Yakisan has extensive international management experience in the transport and mobility industry. Before joining Voith, he was 2021 President of the DACH region at Alstom Transportation, where he led the post-merger integration process following the acquisition of Bombardier. In other senior roles, he was responsible for the transformation of joint ventures and the implementation of complex infrastructure and PPP projects in Africa, the Middle East, and Central Asia, led global restructuring programs for Siemens Mobility, and strategic portfolio initiatives for regional and international rail vehicles.

Müslüm Yakisan brings with him many years of experience in leading international teams, developing future-oriented business models, and digital and cultural transformation. He holds a degree in electrical engineering and studied at the University of Applied Sciences in Braunschweig/Wolfenbüttel.

Nils Fleck has been a member of the Management Board of Voith Turbo since July 2026, leads the Off-Highway Division and was appointed CEO of the ARGO-HYTOS Group.

Nils Fleck has extensive international management experience in the automotive supplier industry. He started his international career at Volkswagen as a production process planer, quality manager and production manager in the engine manufacturing sector. Afterward he joined an international restructuring consultancy. Prior to joining ARGO-HYTOS Nils Fleck was the CEO of Selzer Fertigungstechnik GmbH & Co. KG, an international manufacturer of engine and transmission components and then COO of the Hugo Kern und Liebers GmbH & Co. KG, an international automotive supplier of metal springs and components. In both roles he was responsible for the strategic and operational development of the company and its international business.

With a background in Engineering and Business Engineering, Nils Fleck has extensive expertise in manufacturing operations and the implementation of strategic growth initiatives. His experience combines technical excellence with a strong focus on innovation, customer orientation, and organizational development.