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Stephen P. Mawer

  • Chair of the Board of Directors
  • Class I Director

Stephen P. Mawer has served as Chair of the Board since July 2024 and previously served on the board of the General Partner from March 2016 to July 2024, including as chair of the board of the General Partner from January 2023 to July 2024. From May 2022 until December 2022, Mr. Mawer served in the role of Executive Chair of the Company.  From April 2020 until May 2022, Mr. Mawer served as the Chief Executive Officer of the Company. He retired as president of Koch Supply & Trading in 2014 following a 27-year career in commodities trading, risk management and refining operations. While at Koch, Mr. Mawer led global commodities trading and served as a senior member of the Koch Industries management team. Mr. Mawer holds Bachelor and Master degrees in Chemical Engineering from the University of Cambridge, England. Currently, he serves as a member of the Board of Directors at Zenith Energy Management and Howard Energy Partners, both of which are midstream company, as well as chairman of ClimeCo Corporation, an environmental commodities development and management company, and on the advisory board of Entara Partners, a leading global asset manager of refining infrastructure.  Since December 2025, Mr. Mawer has served as a member of the advisory board of The Heritage Group.  He previously served as a member of the advisory board of Heritage Environmental Services.

 Mr. Mawer contributes valuable expertise in capital markets and financial strategy, supporting the Board’s oversight of capital allocation and financing decisions and provides valuable experience in enterprise-level capital strategy and value-creating transactions. In addition, he brings extensive knowledge of petroleum markets, refining economics, supply/marketing optimization, sustainability and renewable fuels, and risk management.