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David Hartzell has a diverse work experience in the engineering and automotive industry. David began their career as the Chief Engineer for Electrical and Electronic Engineering at Mack Trucks, Inc. from 1998 to 2004. David then joined Mack Trucks Inc. and Volvo Trucks North America as the Director of Product Development from 2005 to 2010. Hartzell then worked at Schramm, Inc. as the VP of Engineering, where they provided senior management leadership for the design and support of drilling rigs and associated equipment. In 2015, they moved to Mack Defense, LLC as the Director of Engineering, responsible for the design and validation of ground vehicles and construction equipment. David then became the President and CEO of Mack Defense, LLC in 2018, where they oversaw all operational and strategic planning and successfully achieved financial goals.

David Hartzell holds a Bachelor of Science degree in Electrical Engineering from Penn State University. No information regarding the specific years of their education or any other academic institutions they may have attended is available.