Carsten Herbes is a professor of international management and renewable energy at Nuertingen-Geislingen University (NGU) and Director of the ‘Institute for International Research on Sustainable Management and Renewable Energy’. His research interests include marketing and acceptance of renewable energies, renewable energy cooperatives, Japanese business and economy. Before joining NGU he worked as a management consultant and board member of a bio-energy company. Christian Friege is the former CEO of LichtBlick AG, a leading green energy company in Germany and a consultant in the field. His research interests include renewable energy, direct selling and customer management. His research was published, among others, in Journal of Service Research and Energy Policy. He has taught at Nuertingen Geislingen University and University of St. Gallen. Currently, he serves as a member of the board of Cewe Stiftung & Co KGaA.