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Klaus Wiesen has a diverse work experience spanning several organizations and roles. Klaus started their career as an Intern at Volkswagen AG in 2009 before becoming a Research Assistant at Universität Kassel. In 2010, they joined the Wuppertal Institut für Klima, Umwelt, Energie gGmbH as a Research Fellow, where they worked on coordinating research activities in sustainability assessment and collaborating with various industries and government entities. Klaus then became a Project Coordinator, responsible for managing research projects in the same organization. In 2017, Klaus became the CEO and Co-Founder of sustainabill – part of VERSO, where they played a significant role in providing sustainable supply chain solutions. Currently, they hold the position of Co-Head Sustainable Supply Chain at sustainabill. Additionally, they are a Sustainable Procurement Ambassador for The Sustainable Procurement Pledge since 2020. Overall, Klaus Wiesen's work experience showcases their expertise in sustainability assessment, project coordination, and leadership in sustainable supply chain management.

From 2003 to 2007, Klaus Wiesen attended Bonn-Rhein-Sieg University of Applied Sciences, where they obtained a degree in Technikjournalismus. Following that, they pursued a Master of Engineering (MEng) in Renewable Energies at HAWK - University of Applied Science and Arts, from 2007 to 2010.