Mark W. de Koff

Mark W. de Koff is an experienced supply chain and marketing professional currently serving as the Manager of Global Business Segments Specialties at HF Sinclair, overseeing marketing strategies for Specialty products, including Sonneborn-branded items. Mark previously held various managerial roles in supply chain and product line management at HF Sinclair and HollyFrontier Corporation, focusing on optimizing supply chain processes and managing product lines across EMEA and APAC regions. Before joining HF Sinclair, Mark gained diverse experience in supply chain management through roles at Sonneborn, NRG-Office, and other organizations. Mark holds a Master of Science in Supply Chain Management and a Bachelor of Science in Business Administration from the Rotterdam School of Management, Erasmus University.