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Guillaume Joncquet has a diverse and extensive work experience in the field of purchasing and supply chain management. Guillaume currently serves as the Purchasing Partnerships Director at HYVIA starting from February 2023. Prior to this, they worked as the Purchasing & Supply Chain Director at Hopium from April 2021 to February 2023. Guillaume also held multiple roles at Safran, including Purchasing Department Manager from January 2018 to April 2021, Program Purchasing Manager from January 2016 to December 2017, Program Purchasing from September 2014 to December 2015, and International Partnership / Key Account Manager from October 2012 to September 2014. Additionally, they have experience working at Groupe PSA, where they served as a Senior Commodity Buyer from June 2009 to October 2012, R&D Hydrogen Project Manager from June 2005 to June 2009, and Fuel Cell Design & Simulation Engineer from September 2001 to June 2005.

Guillaume Joncquet completed their Executive MBA at IAE Paris - Sorbonne Business School from 2021 to 2022. Earlier, they obtained a Master's degree in Energétique et Aérothermochimie from the Institut national des Sciences appliquées de Rouen in 2001. Prior to that, they also earned a Bachelor's degree in Mécanique, Thermique from the same institute, graduating in 2001.