Alexander Dauensteiner studied mechanical engineering at the University of Stuttgart and graduated in 1998. After several years at the Fraunhofer Institute IPA in Stuttgart focusing on eco-design and life cycle management, he moved to the Wuppertal Institute for Climate, Environment and Energy and worked with Ernst Ulrich von Weizsäcker and Amory Lovins on the topic of the 1-liter car.
In 2002, he moved to heating appliance manufacturer Vaillant as project manager for fuel cell heating appliances and became head of product management innovation three years later. From 2015 to 2017 he was Head of Product Management System Products and from February 2017 to October 2019 Senior Association Manager Digitalization of the Vaillant Group.
In October 2019, he moved to Viessmann in Allendorf (Eder) as Product Line Owner Fuel Cells. He is also responsible for Viessmann's global hydrogen activities and since May 2022 also for gas appliances in residential and light commercial applications as well as floor-standing gas and liquid fuel appliances. He is Maximilian Viessmann's sherpa on the German government's National Hydrogen Council.