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Mark Howenstine has extensive work experience in the construction and building materials industry. Mark first joined USG in 1998 as a Field Sales Manager, where they managed sales activities in the field. Mark then transitioned into the role of Product Marketing Manager in 2000, where they were responsible for marketing USG's products. After their successful stint as a Product Marketing Manager, Mark became a National Accounts Manager in 2005, overseeing key accounts for the company until 2019. In 2020, they joined Grabber Construction Products as a Product Manager, where they played a vital role in product development and management. Their contributions and expertise led him to be promoted to the position of Director of Sales - Retail in 2022 at Grabber Construction Products.

Mark Howenstine has a BS in Marketing from Indiana University - Kelley School of Business and an MBA from Samford University. Mark also has a Lean Six Sigma Green Belt USG Certification from USG, obtained in 2017.