Board of Directors
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Board of Directors

References to “Predecessor” on this site refer to Calumet Lubricants Co., Limited Partnership and its subsidiaries, the assets and liabilities of which were contributed to Calumet Specialty Products Partners, L.P. and its subsidiaries upon the completion of our initial public offering in 2006. References on this site to “our general partner” refer to Calumet GP, LLC, the general partner of Calumet Specialty Products Partners, L.P. On July 10, 2024, Calumet Specialty Products Partners, L.P. completed a conversion of its structure from a master limited partnership to a C-Corporation following unitholder approval, pursuant to which unitholders of Calumet Specialty Products Partners, L.P. became shareholders of Calumet, Inc.

  • 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.

  • Todd Borgmann

    • Class II Director

    Todd Borgmann has served as a member of the board of directors of Calumet, Inc. since July 2024 and as President and Chief Executive Officer since May 2022.  From February 2021 until May 2022, Mr. Borgmann served as Executive Vice President—Chief Financial Officer of the General Partner. Mr. Borgmann has over fifteen years of experience with Calumet, serving the Company across a diverse set of management roles. For the five years preceding the appointment to his current position, Mr. Borgmann served as Senior Vice President - Chief Financial Officer, Senior Vice President - Interim Chief Financial Officer, Vice President of Supply & Trading, developing extensive knowledge of petroleum markets, refining operations and risk management. Mr. Borgmann has also served as Calumet’s Vice President of Business Development and Director of the Company’s White Oils and Petroleum sales. Mr. Borgmann earned a Bachelor of Science in Industrial Engineering from Purdue University and a Master of Business Administration from the University of Notre Dame.

    Mr. Borgmann brings significant leadership experience, strong financial acumen and extensive knowledge of and experience in petroleum markets, refining operations, and risk management, as well as strategic growth, investment and transformational initiatives.

  • John (Jack) Boss

    • Class I Director
    • Independent Director

    John (“Jack”) G. Boss has served as a member of the Board since July 2024 and previously served on the board of the General Partner from August 2022 to July 2024.    Mr. Boss brings over 40 years of experience to the Board of Calumet. He currently serves on the Board of Directors of Cooper-Standard (NYSE: CPS), Wabash National (NYSE: WNC) and Libbey, Inc. Most recently, he was the President and Chief Executive Officer of Momentive Performance Materials, a specialty chemicals and materials business from 2014 until 2020. Prior to this role, Mr. Boss served in the role of President of Honeywell Safety Products from 2012 to 2014. Mr. Boss held various managerial roles within Honeywell’s Specialty and Chemicals businesses from 2003 through 2014. Prior to Honeywell, Mr. Boss served as Vice President at Great Lakes Chemical Corporation. Mr. Boss holds a B.S. in Mechanical Engineering from West Virginia University and an MBA from Rutgers University.

    Mr. Boss brings extensive specialty chemicals and materials knowledge. In addition, he brings to the Board deep expertise in overseeing public company capital strategy, business development and growth, capital allocation, and enterprise strategic planning initiatives as a result of his service as a director of other public and private companies.

  • Karen Narwold

    • Class I Director
    • Independent Director

    Karen Narwold has served as a member of the Board since June 2025. Ms. Narwald most recently served as Executive Vice President, Chief Administrative Officer, General Counsel and Corporate Secretary of Albemarle Corporation, a specialty chemicals manufacturing company, from 2010 until her retirement in 2023. From 2007 to 2010, Ms. Narwold served in a variety of leadership roles with Symmetry Holdings and its related companies, including General Counsel to Symmetry Holdings, Vice President, Chief Administrative Officer and General Counsel at Barzel Industries (acquired by Symmetry Holdings and f/k/a Novamerican Steel) and Advisor at Symmetry Advisors. Ms. Narwold worked for five years in private legal practice, followed by 16 years in roles of increasing leadership responsibility with GrafTech International, Ltd., including Vice President, General Counsel, Human Resources and Company Secretary. Ms. Narwold holds a Bachelor of Arts in Political Science from the University of Connecticut and a Juris Doctor from the University of Connecticut School of Law.

    Ms. Narwold currently serves on the board of directors of Ingevity (NYSE: NGVT), where she is chair of the Sustainability and Safety Committee, a member of the Audit Committee, and a member of the Executive Committee. . In addition, Ms. Narwold serves on the board of directors of Standard Lithium Ltd., where she is chair of the Nominating & Corporate Governance Committee and a member of the Compensation Committee. Ms. Narwold is National Association of Corporate Directors (NACD) Directorship Certified.

    Ms. Narwold brings extensive experience in global industrial manufacturing, regulatory, business strategy, governance, risk management and corporate transactions, informed by her years of leadership through periods of growth, transformation and capital redeployment. Through her extensive experience advising public companies, Ms. Narwold contributes valuable insight into capital markets and financing alternatives. In addition, she brings a broad range of experiences and skills as a result of her service as a public company director and her NACD certification.

  • Paul Raymond III

    • Independent Director
    • Class III Director

    Paul C. Raymond III has served as a member of the Board since July 2024 and previously served on the board of the General Partner from November 2020 to July 2024.  Mr. Raymond brings over three decades of industry experience, which includes serving in his current role of chief executive officer of Monument Chemical, a privately held company, since July 2020, and previously as president and chief executive officer of Sonneborn, LLC from 2012 to 2019. Mr. Raymond holds a Bachelor of Science in Chemical Engineering from Rice University and a Doctor of Philosophy in Chemical Engineering from the University of Texas at Austin.

    Mr. Raymond brings extensive specialty chemicals knowledge and strategic insights, as well as experience leading and growing similar businesses. He provides extensive experience in growth-oriented investment strategies, capital efficiency and disciplined execution of strategic initiatives. 

  • Daniel J. Sajkowski

    • Class II Director
    • Independent Director

    Daniel J. Sajkowski has served as a member of the Board since July 2024 and previously served on the board of the General Partner from September 2014 to July 2024. Mr. Sajkowski served as Executive Vice President, Growth and New Ventures of The Heritage Group, a privately held business managing a diverse portfolio of operating companies in heavy construction and materials, from 2013 until his retirement in 2025. He currently serves on the Advisory Board of Trident Consulting. Prior to joining The Heritage Group, Mr. Sajkowski was the Senior Director—Downstream Technology at Sapphire Energy from 2010 until 2013. From 2004 to 2010, Mr. Sajkowski served as business unit leader at BP’s Whiting, Indiana refinery. During his career with BP/Amoco, Mr. Sajkowski also held positions as the Manager of Integrated Supply and Trading from 2002 until 2004 and Vice President of Refining Technology from 2000 until 2002. Mr. Sajkowski holds Bachelor of Science and Master of Science degrees in Chemical Engineering from the University of Michigan and a Doctor of Philosophy in Chemical Engineering from Stanford University. He also completed The General Manager Program at Harvard.

    Mr. Sajkowski has extensive refining industry experience including planning, operations and managerial roles for a large multinational refining company. In addition, he provides the Board with an important perspective on capital markets conditions and financing strategies based on his decades of experience in capital raising activities and driving growth. His broad background of experience provides helpful insight to the Company in our implementation of strategic value-creating corporate initiatives, as well as our refinery operations in general.

  • Bradford T. Sanders

    • Class II Director
    • Independent Director

    Bradford T. Sanders has served as a member of the Board since June 2026. Mr. Sanders currently serves as an advisor to the Chief Executive Officer of US Development Group, a developer, builder, operator and manager of energy-related midstream infrastructure and logistics services. Mr. Sanders has held this position since September 2023. In May 2014, Mr. Sanders joined US Development Group as Executive Vice President, Head of Market Strategy, and he became Chief Commercial Officer in October 2014, working with leadership teams to identify and execute strategic commercial opportunities. Prior to joining US Development Group, Mr. Sanders spent 32 years at Koch Industries, where he built and led trading and commercial businesses spanning crude oil, natural gas liquids, refined products, gasoline components, plastics, and ethanol. Mr. Sanders advises boards and executives on strategy, capital allocation, governance, and risk management. He holds a Bachelor of Science in Business from the University of Kansas and serves on the University of Kansas Board of Trustees, where he serves on the Investment Committee.

    Mr. Sanders brings extensive leadership experience across the energy value chain, including refining, chemicals, trading, logistics, and renewable fuels. In addition to his extensive industry expertise, he provides valuable insights into strategic growth initiatives, capital raising and allocation and risk management.

  • Amy Schumacher

    • Independent Director
    • Class III Director

    Amy M. Schumacher has served as a member of the Board since July 2024 and previously served on the board of the General Partner from September 2014 to July 2024.  Ms. Schumacher has been part of The Heritage Group family of businesses since 2003, working in various capacities and leading a variety of growth projects along the way. In 2008, Ms. Schumacher founded Monument Chemical and served as President and CEO for eight years. In 2016, Ms. Schumacher transitioned to President of The Heritage Group and was appointed Chief Executive Officer in 2020. From 1998 to 2003, Ms. Schumacher served as a consultant with Accenture. Ms. Schumacher holds a Bachelor of Science in Civil Engineering from Purdue University and a Master of Science in Management from the Massachusetts Institute of Technology Sloan School. Ms. Schumacher currently serves as Chief Executive Officer and a trustee for The Heritage Group and sits on a number of private subsidiary boards. Ms. Schumacher is the daughter of Fred M. Fehsenfeld, Jr., the former chair of the board of the General Partner.

     Ms. Schumacher has extensive managerial experience including planning and strategy. With a track record of supporting long-term value creation through strategic financial stewardship, she possesses a broad background within the chemicals industry, with specific experience in strategic growth projects.

  • Karen Twitchell

    • Class III Director
    • Lead Independent Director

    Karen A. Twitchell has served as a member of the Board since July 2024 and previously served on the board of the General Partner from August 2022 to July 2024. In 2025, Ms. Twitchell was appointed by the Board’s independent directors to serve as the Board’s Lead Independent Director. Ms. Twitchell brings more than a dozen years of Board experience and 30 years of executive experience to the Board of Calumet. She is also on the Board of HMTX Industries.  Previously, Ms. Twitchell was chair of the board of directors of Trecora Resources (NYSE: TREC), a petrochemical and specialty wax manufacturer, until the sale of the company in June 2022. Previously, she also served on the board of directors of Kraton Corp. and KMG Chemical, both specialty chemical companies.  From 2010 to 2013, Ms. Twitchell was Executive Vice President and Chief Financial Officer of Landmark Aviation, a private equity-backed fixed base operator for the aviation industry. Prior to 2010, Ms. Twitchell was Vice President and Treasurer of LyondellBasell Industries/Lyondell Chemical Company. Ms. Twitchell has also held senior management positions in the aluminum and cement manufacturing industries. Ms. Twitchell holds a Bachelor of Arts in Economics from Wellesley College and a Master of Business Administration from Harvard Business School. 

    Ms. Twitchell brings extensive leadership experience in the chemicals industry, strong financial acumen as a former chief financial officer and treasurer, and extensive experience in capital markets, capital allocation oversight and financial strategy. As our Lead Independent Director, Ms. Twitchell brings to bear her significant experience on the boards of directors of public and private companies. Her background provides helpful insight to the Company in our implementation of strategic and financial initiatives and corporate governance structure and processes.

  • Julio Quintana

    • Class I Director
    • Independent Director

    Julio Quintana has served as a member of the Board since June 2025. Mr. Quintana served as President and Chief Executive Officer and member of the board of directors of Tesco Corporation, an oilfield services company, from 2005 until his retirement in 2015. Prior to his appointment as President and Chief Executive Officer of Tesco, Mr. Quintana served as Executive Vice President and Chief Operating Officer. Prior to joining Tesco, Mr. Quintana worked for Schlumberger Corporation, an oilfield services company, from 1999 to 2004 as Vice President of Integrated Project Management and Vice President of Marketing for the Americas. Prior to Schlumberger, Mr. Quintana worked for nearly 20 years for Unocal Corporation, an integrated exploration and production company, in various operational and managerial roles. Mr. Quintana holds a Bachelor of Science in Mechanical Engineering from the University of Southern California.

    Mr. Quintana currently serves on the board of directors of Newmont Corporation (NYSE: NEM), where he is a member of the Corporate Governance and Nominating Committee and chair of the Leadership Development and Compensation Committee. He also serves as chair of the board of directors and member of the Sustainability and Governance Committee of SM Energy Company (NYSE: SM). Mr. Quintana previously served on the board of directors of California Resources Corporation from 2020 until 2024 and Basic Energy Services from 2016 until 2021.

    Mr. Quintana has extensive global management experience in petroleum markets and energy-industry operations. As the former chief executive officer of a public company, Mr. Quintana provides significant capital markets expertise and valuable experience in driving strategic growth and investment initiatives. In addition, Mr. Quintana brings significant corporate governance experience based on his extensive experience on the boards of directors of public and private companies.