Stefan is an international sustainability and communications executive and has 30 years of experience in public relations, strategic communication planning and public affairs. He has lived and worked for a variety of NGOs, technology and finance companies, consultancies and PR agencies in Germany, UK, Belgium, France and the U.S. Stefan has overseen a large number of studies, research projects, campaigns and conferences on climate protection, sustainable urbanization, digitalisation and infrastructure, including the Green City Index, the first comprehensive analysis of the environmental performance of the world's 150 largest cities. He built a public exhibition and conference center on sustainable urbanization for Siemens and the City of London. He designed and facilitated conferences on climate, infrastructure and digitization topics in numerous cities in Europe, the U.S., Latin America and Asia. In Brussels, Mr. Denig was responsible for global communication for EIT Climate KIC and the Global Covenant of Mayors for Climate & Energy. He acts as a Strategic Advisor for ifok, one of Europe’s largest consultancy firms for public participation and stakeholder engagement.