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William Theisen

As CEO for EcoAct, an Atos company, for North America with 14 years’ of experience in sustainability, William leads a team of experts supporting Global and Fortune 500 companies to develop and implement net-zero strategies. This includes managing projects for the private sector at any stage of their sustainability journey, including assessing emissions both direct and throughout the supply chain, setting and creating roadmaps for Science Based Targets (short term and net-zero), climate scenario analysis, and alignment with reporting frameworks and guidelines (CDP, TCFD, SASB). At EcoAct, we also develop carbon offsets projects (Nature and Technology Based Solutions) and support companies in procuring high quality carbon offsets to achieve their carbon neutral goals.

Currently based in NYC, William has an MBA from HEC – Paris has worked in sustainability and carbon offset project development while based in the USA, France, Mali, and Cambodia.