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.

  • Stephen P. Mawer

    Stephen Mawer has served as Executive Chairman our general partner since May 2022.  Prior to that, he was Chief Executive Officer of our general partner since April 2020 and a board member of our general partner since March 2016. 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, a midstream company, as well as chairman of ClimeCo Corporation, an environmental commodities development and management company. Mr. Mawer brings extensive knowledge of petroleum markets, refining economics, supply/marketing optimization and risk management.

  • James S. Carter

    James S. Carter has served as a member of the board of directors of our general partner since January 2006. Mr. Carter worked in various capacities at ExxonMobil including vice president of U.S. marketing and sales of fuels and specialty products, manager of U.S. refining and marketing planning and analysis, manager of U.S. distribution activities, analysis manager of ExxonMobil International, and advisor to ExxonMobil headquarters for European refining and marketing until his retirement in 2003. Mr. Carter is a member of the Association of Audit Committee Members, Inc. Mr. Carter received his B.S. in mechanical engineering from Clemson University and his M.B.A. in finance and accounting from Tulane University.

    Mr. Carter brings extensive marketing and managerial experience with one of the largest integrated energy companies in the world. He possesses a broad background in petroleum products marketing, with specific experience in the marketing of fuel products.

  • Amy Schumacher

    Amy M. Schumacher has served as a member of the board of directors of our general partner since September 2014. Ms. Schumacher has served as the president of Monument Chemicals, Inc. and Haltermann Solutions since 2010. In addition, in July 2016, Ms. Schumacher assumed the role of president of The Heritage Group. Prior to joining Monument Chemicals, Inc. and Haltermann Solutions, Ms. Schumacher worked in various capacities for The Heritage Group leading a variety of growth projects from 2003 until 2010. From 1998 to 2003, Ms. Schumacher was a consultant with Accenture. Ms. Schumacher received her B.S. in civil engineering from Purdue University and her M.S. in management from the Massachusetts Institute of Technology Sloan School. Ms. Schumacher currently serves as 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 chairman of the board of our general partner.

    Ms. Schumacher has extensive managerial experience including planning and strategy. She possesses a broad background within the chemicals industry, with specific experience in strategic growth projects.

  • Daniel J. Sajkowski

    Daniel J. Sajkowski has served as a member of the board of directors of our general partner since September 2014. Mr. Sajkowski has served as executive vice president, growth and new ventures of The Heritage Group since 2013. 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 earned his B.S. and M.S. degrees in chemical engineering from the University of Michigan and a Ph.D. in chemical engineering from Stanford University. He also completed the General Manager Program at Harvard University.

    Mr. Sajkowski has extensive refining industry experience including planning, operations and managerial roles for a large multinational refining company. His broad background of experience provides helpful insight to the Company in its implementation of strategic initiatives and its refinery operations in general.

  • Daniel L. Sheets

    Daniel L. Sheets has served as a member of the board of directors of our general partner since November 2018. Mr. Sheets previously served as president of Lubrizol Additives and corporate senior vice president of The Lubrizol Corporation, a global company providing specialty chemicals for transportation, industrial and consumer markets, from 2008 until his retirement in 2018. Mr. Sheets joined Lubrizol in 1984 and served in a variety of roles including vice president of sales,  vice president of engine additives , global business manager fuels, refinery and oilfield products and business development roles which led to multiple acquisitions and an assignment in Germany. Mr. Sheets received his B.S. in electrical engineering from The Pennsylvania State University.

    Mr. Sheets has extensive global management experience in specialty chemicals including strategy, commercial excellence, business development and acquisitions.

  • Paul Raymond

    Paul Raymond has served as a member of the board of directors of our general partner since November 2020. He brings over three decades of industry experience, which includes serving in his current role of chief executive officer of Monument Chemical and previously as president and chief executive officer of Sonneborn, LLC. Mr. Raymond brings extensive specialty chemicals knowledge and strategic insights, and his impressive track record leading and growing similar businesses makes him a terrific asset to the Partnership's board of directors. Mr. Raymond holds a B.S in chemical engineering from Rice University and earned his Ph.D. in chemical engineering from the University of Texas at Austin.

  • Jennifer Straumins

    Jennifer Straumins currently serves as the Chair of specialty petroleum manufacturing, marketing and distribution company Maverick Performance Products. In addition to her role with Maverick, Ms. Straumins serves as a director on the board of Wincoram Asset Management, LLC. Prior to her current roles with both Maverick Performance Products and Wincoram Asset Management, Ms. Straumins served the Partnership in a number of executive roles, most recently as President and Chief Operating Office of the Partnership, a role she held from 2011 to 2015. Prior to her roles with the Partnership, Ms. Straumins held financial planning positions with Great Lakes Chemical Company as well as Exxon Chemical Company. Ms. Straumins received a B.E. in Chemical Engineering from Vanderbilt University and an M.B.A. from the University of Kansas.

    Ms. Straumins was selected by the Grube Family Group as their appointee to the Board pursuant to their rights as minority owners under the Company’s Operating Agreement. Ms. Straumins brings extensive managerial and executive experience to the board of directors of Calumet, having served the Partnership and other companies in the petrochemical industry over her 25 year career. 

  • John (Jack) Boss

    Mr. Boss brings over 40 years of experience to the Board of Calumet.  He is currently on the Board of Directors of Cooper-Standard (NYSE: CPS), Wabash National (NYSE: WNC) and Libbey, Inc.  Most recently, he was President and CEO of Momentive Performance Materials, a specialty chemicals and materials business from 2014 until 2020.  Prior to Momentive, he was President of Honeywell Safety Products from 2012 to 2014.  He held various managerial roles within  Honeywell’s Specialty Materials and Chemicals businesses from 2003 through 2014.  Prior to Honeywell, he served as Vice President at Great Lakes Chemical Corporation.  He also has experience at International Specialty Products, Allied Signal Corporation and Dresser Industries.  Mr. Boss has an MBA from Rutgers University and a BS in Mechanical Engineering from West Virginia University.

  • Karen Twitchell

    Ms. Twitchell brings more than a dozen years of Board experience and 30 years of executive experience to the Board of Calumet. She was Chair of the Board of Trecora Resources (NYSE: TREC), a petrochemical and specialty wax manufacturer, until the sale of the company in June 2022. In addition, she serves on the Board of Kraton Corp and HMTX Industries. Previously she served on KMG Chemicals’ (NYSE: KMG) Board. 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, she 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 has an MBA degree from Harvard Business School and a BA in Economics from Wellesley College.