INVESTOR CENTER

  • Pamela R. Butcher

    Pamela R. Butcher

    Director

    Pamela R. Butcher served as Chief Executive Officer, President and Chief Operating Officer of Pilot Chemical Corp., a global specialty chemical company, from January 2010 until her retirement in January 2021. Ms. Butcher has served as a member of the Board of Directors of Pilot since 2016, and currently serves as a Special Advisor to the Chairman. Prior to joining Pilot, Ms. Butcher held a number of senior leadership positions at The Dow Chemical Company (now Dow, Inc.), including Vice President and General Manager of Adhesives and Sealants and Vice President Corporate Marketing & Sales, and she also previously served as President of Hampshire Chemical Company. Ms. Butcher joined the Company’s Board in July 2023. Public company directorships in the last five years: PDC Energy Inc. (from February 2022 to August 2023); and Trecora Resources (from November 2016 to June 2022); as well as private equity held Gruden Topco Holdings/Quality Distribution, Inc. (from 2016 to 2021), helping lead all three organizations through their successful acquisitions by other enterprises. She also currently serves as a director of the JM Huber Corporation, a privately held industrial products and engineering materials company.

  • John T. Drexler

    Director

     

    John T. Drexler has served as our President since February 2024. Prior to that, he served as our Senior Vice President and Chief Operating Officer from April 2020 to February 2024 and our Senior Vice President and Chief Financial Officer from 2008 to April 2020. Mr. Drexler joined the Company in 1998, and over the years has held a number of other senior level finance and accounting positions at the Company, including Vice President-Finance and Accounting from 2006 to 2008. Mr. Drexler started his career at Ernst & Young LLP in 1991. Mr. Drexler previously served on the board of directors of Knight Hawk Holdings, LLC., a privately held company of which the Company held an ownership interest. Mr. Drexler joined the Company’s Board of Directors in May 2024. Public company directorships in the last five years: None.

  • Holly Keller Koeppel

    Holly Keller Koeppel

    Director

     

    Holly Keller Koeppel served as Managing Partner and head of Gateway Infrastructure Investments L.P. from March 2015 to January 2017. From 2010 to February 2015, she was Partner and Global Co-Head of Citi Infrastructure Investors, a division of Citigroup, Inc. Ms. Koeppel served as Executive Vice President and Chief Financial Officer of American Electric Power Corporation (“AEP”) from 2006 to 2009 and several additional executive positions at AEP from 2000 to 2006. Ms. Koeppel joined the Company’s Board of Directors in February 2019. Public company directorships in the last five years: AES Corporation (from April 2015 to the present); British American Tobacco plc (from July 2017 to the present); Flutter Entertainment plc (from May 2021 to present); and Vesuvius plc (from April 2017 to May 2021).

  • Patrick A. Kriegshauser

    Patrick A. Kriegshauser

    Director

     

    Patrick A. Kriegshauser serves as Executive Vice President and a director of ArchKey Holdings, Inc., a privately held company, having previously served as its Executive Vice President and Chief Financial Officer from July 2017 until July 2023. Mr. Kriegshauser has also served as Executive Vice President, Chief Financial Officer and principal owner of Sachs Electric Company, which is owned by ArchKey Holdings, Inc. From 1985 to 2000, Mr. Kriegshauser served in various senior level capacities at the Company, including serving as Senior Vice President and Chief Financial Officer from 1996 to 2000. He started his career at PricewaterhouseCoopers LLP in 1981. Mr. Kriegshauser joined the Company’s Board of Directors in October 2016. Public company directorships in the last five years: None.

  • Paul A. Lang

    Paul A. Lang

    Chief Executive Officer

     

    Paul A. Lang is the Company’s Chief Executive Officer, serving in such capacity since April 2020. Mr. Lang joined the Company in 1984 and – prior to assuming his current role – served as our President and Chief Executive Officer from April 2020 to February 2024, and as our President and Chief Operating Officer from April 2015 through April 2020, and as Executive Vice President and Chief Operating Officer from April 2012 through April 2015. He previously held a variety of engineering and operating positions at both the Company’s eastern and western operations, and served on the Company’s Board from 2014 through 2016. Mr. Lang is a member of the executive committee of the National Mining Association and a member of the Board of Trustees at the Missouri University of Science and Technology. He also has experience serving on the boards of directors of private companies, including Knight Hawk Holding, LLC. Public company directorships in the last five years: None.

  • Richard A. Navarre

    Richard A. Navarre

    Chair

     

    Richard A. Navarre served as Chief Executive Officer and President of Covia Corporation, a privately held company, from May 2019 to May 2021. He served as President and Chief Commercial Officer of Peabody Energy Corporation from 2008 until 2012 and as Peabody’s Chief Financial Officer and Executive Vice President of Corporate Development from 1999 to 2008. Prior to joining Peabody in 1993, Mr. Navarre was a senior manager with KPMG, LLP. Mr. Navarre joined the Company’s Board of Directors in October 2016 and became Chair in May 2024. Public company directorships in the last five years: Civeo Corporation (from June 2014 to the present); Covia Corporation (from June 2018 to May 2021); and Natural Resource Partners L.P. (from October 2013 to the present).
  • Molly P. Zhang

    Molly P. Zhang

    Director

     

    Dr. Molly P. Zhang served as Vice President of Asset Management and Global Manufacturing Executive for Mining Systems etc. at Orica Limited, a global mining services company, from 2011 to 2016. Prior to Orica, Ms. Zhang held various senior leadership positions at Dow, Inc. including Managing Director, SCG-Dow Group and Global Business Vice President for Dow’s Technology Licensing and Catalyst business as well as Manufacturing Director for Dow Asia Pacific. Ms. Zhang joined the Company’s Board of Directors in January 2022. Public company directorships in the last five years: Gates Industrial Corporation plc (from July 2020 to the present); Aqua Metals, Inc. (from March 2021 to the present); GEA Group AG (from April 2016 to December 2021); Cooper-Standard Holdings, Inc. (from May 2017 to May 2020); and Newmont Mining Corporation (from July 2017 to June 2019).