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.

Since December 2025 Müslüm Yakisan is responsible for the Marine & Rail Division.

Dr. Marcus Fischer has been a member of the Management Board of Voith Turbo since June 2024 and was appointed CEO of the ARGO-HYTOS Group. He will continue to serve as COO in a dual role until further notice.

Dr. Fischer has been with ARGO-HYTOS for 17 years. He started as Head of Engineering in 2007, joined the management board of ARGO-HYTOS GmbH in Kraichtal in 2010, and at the same time took on the role of Group CTO.

Since early 2016, he has held the position of COO for the entire ARGO-HYTOS Group.

Before joining ARGO-HYTOS, Dr. Fischer was Head of Engineering at Weber-Hydraulik GmbH, where he was responsible for design, development, and advanced engineering.

Dr. Marcus Fischer studied Mechanical Engineering at RWTH Aachen University and the University of Dortmund.