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Stefan Wallner has over 30 years of work experience in various roles related to electrical engineering and technology. Stefan began their career in 1988 at ABB, where they worked on the development of power electronics. Stefan then took on leadership positions at Crown Lift Trucks and Jungheinrich AG, overseeing electrical engineering and drives. In 1997, they joined Proton Motor Fuel Cell GmbH as the head of electrical engineering for the TriHyBus project, a role they held until 2010. Stefan then served as the Managing Director of their own company, Wallner Energietechnik GmbH, from 2007 to 2016. During this time, they also worked on projects involving electric vehicle charging for companies such as BMW, Porsche, and Bombardier. In 2016, they joined Proton Motor Fuel Cell GmbH as the Head of the Electrical Department. Throughout their career, Stefan Wallner has been involved in various aspects of electrical engineering and has demonstrated expertise in fuel cell technology and electric vehicle charging systems.

Stefan Wallner completed their education at the Hochschule München University of Applied Sciences, where they studied elektrische Energietechnik and obtained a degree in Diplom-Ingenieur. Stefan attended this institution from 1983 to 1988. In addition, they hold a certification as Dipl. Ing. (FH), although further details about the institution, month, and year of obtaining the certification are not provided.