John Gieseman has served as the Chief Operating Officer for Allegiance Refining since February 2021. He has 37 years of experience in the refining industry in areas relating to product and process optimization, process unit design, commercial activities, and capital utilization.

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Mr. Gieseman began his career with Honeywell UOP in 1985 and spent most of his nearly 15 years with the company in engineering and technical positions servicing refineries and petrochemical plants. In 1999, he joined Lummus and oversaw Lummus’ Refining Business group. In 2008, Mr. Gieseman joined Jacobs Consultancy where he led numerous initiatives to improve the operations and longer-term strategies for their refining clients. After working for two years as the Director of Process Industries for a small EPC company, he formed his own consulting company in 2020, Riverside Process Engineering & Consulting LLC, an energy advisory firm.

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Mr. Gieseman holds a Bachelor of Science in Chemical Engineering from the University of Notre Dame and a Master of Business Administration with concentrations in Finance, Marketing, and International Business from Northwestern University.