About William Theisen


Head of Net Zero Transformation, Atos North America

Since 2017, William leads EcoAct’s operations in North America supporting organizations to develop and implement climate neutrality and net-zero strategies. With over 12 years of experience in finance and development of low-carbon projects, William has worked with a wide range of clients and sectors, including Royal Philips, Schlumberger, Estée Lauder Companies, Trane, United States Tennis Association, Mastercard, and Etsy. Graduated from Boston University, William holds an MBA from HEC Paris and before joining EcoAct he worked at the Gold Standard Foundation and at both NGOs Nexus and GERES (Group for the Environment, Renewable Energy and Solidarity), where he participated in the development of multiple low-carbon projects in Africa and Asia, supported by carbon finance and crowdfunding. As Director of Business Development and Nexus Partnerships, William built and sustained partnerships with international companies such as Deutsche Post DHL Group, The Coca-Cola Company and Veolia Water. William is frequently invited as a speaker in conferences and events at the national and international level in matters related to corporate climate action and low carbon development.




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