Board of Directors

Stephen P. Mawer

• Chair of the Board of Directors

Stephen P. Mawer has served  as chair of the board of Calumet, Inc. since July 2024.  Mr. Mawer previously served as the chairman of the board of Calumet GP, LLC (the “General Partner”) from January 2023 through July 2024 and served as a board member of the General Partner from March 2016 through July 2024. From May 2022 until December 2022, Mr. Mawer served in the role of Executive Chairman of the General Partner. From April 2020 until May 2022, Mr. Mawer served as the Chief Executive Officer of the General Partner. 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’s and Master’s 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. He previously served as a member of the advisory board of Heritage Environmental Services.

Mr. Mawer brings extensive knowledge of petroleum markets, refining economics, supply/marketing optimization, sustainability and renewable fuels, and risk management.

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  Member
  Risk Committee
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  Member
  Strategy & Growth Committee