William Theisen


William comes with more than 10 years of experience in climate finance and carbon mitigation project development.

A graduate from Boston University with an MBA from HEC Paris, William began working in climate finance with the Gold Standard Foundation, a certification body headquartered in Geneva that evaluates carbon reduction and sustainable impacts using results-based methodologies. Following this role, he worked with NGOs Nexus for Development (Nexus) and the Group for the Environment, Renewable Energy and Solidarity (GERES) to scale-up more than a dozen carbon reduction projects in Asia and Africa by leveraging innovative market mechanisms such as carbon finance and crowd funding. As Director of Business Development and Partnerships and Nexus, William established partnerships to support these projects with numerous companies worldwide, which including Deutsche Post DHL, Coca-Cola, and Veolia Eau. In collaboration with Yale University, William also performed in field research while based in Mali focused on the evaluating the risks and opportunities in the value chain for carbon finance and clean cookstove programs in West Africa.

William is also on the Executive Committee for the International Carbon Reduction and Offset Alliance (ICROA).