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Holger holds a PhD (2010) from ETH Zurich (MTEC) and a diploma in Business Administration from KU Eichstätt-Ingolstadt with exchange semesters at Sophia University Tokyo and Comenius University Bratislava. He joined greenTEG in 2014 during a consulting project. Holger is member of the management board and responsible for Sales & Marketing. He brings to greenTEG his experience from former roles at McKinsey as a project leader and as independent consultant later on.