David Hart is Director of E4tech, a Switzerland and UK-based business consulting company specialising in the energy transition, and a Visiting Professor at Imperial College London. He is recognised internationally for his expertise in hydrogen energy. Based in Lausanne, he is responsible for E4tech's fuel cell and hydrogen energy practice, and has been an adviser, consultant and researcher on fuel cells and hydrogen energy for 25 years, leading and conducting projects in different industry sectors for governments, corporations and investors worldwide. Current work includes support for major energy players in developing hydrogen strategies, analysis of supply chain opportunities for specialists in the fuel cell industry, and policy options for economic growth based on hydrogen and fuel cell deployment. Hart has sat on venture capital investment committees and clean energy company boards, is a director of the International Association of Hydrogen Energy and is lead author of Fuel Cell Industry Review.