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Marius Retz began their work experience in 1999 with the German Air Force as an Aircraft Mechanic, where they worked until 2000. In 2007, they joined the Witzenmann Group as a Project Engineer and held this position until 2014 when they became a Department Leader. From 2011 to 2013, Marius participated in the Witzenmann High Potential Program. Currently, they serve as the Head of Sales at the Witzenmann Group, a position they have held since February 2020.

Marius Retz obtained a Diplom-Ingenieur degree in the field of Maschinenbau from Karlsruhe University of Applied Sciences. The specific start year is not mentioned, but their education at the university ended in 2007.