Carbo Ceramics Culture Company

Mr. Roger L. Riffey has been a Vice President of Manufacturing at CARBO Ceramics Inc. since May 1, 2013. Mr. Riffey served as Director of Logistics and Customer Service, since he joined CARBO Ceramics Inc. in July 2006 until July 2010 and served as its Plant Manager of the Toomsboro, Georgia, facility since July 2010. Mr. Riffey held positions with Rio Tinto Energy in Special Projects at U.S. Borax as Global Logistics Manager and served as Manager of Marketing at Kerr-McGee Coal Corporation.

Mr. Don P. Conkle has been Vice President of Marketing and Sales at CARBO Ceramics Inc. since October 1, 2012. Prior to CARBO, Mr. Conkle served at Schlumberger, where he served as Production Group Marketing and Technology Director. He held career with Schlumberger for 26 years. He held a variety of leadership positions within Schlumberger with particular emphasis on Pressure Pumping products and services and other recovery related products. He served as Geomarket Manager, Global Vice President of Stimulation Services, Theme Technical Director of High Volume, Global Personnel Manager of Well Services and Middle East Technique Manager of Well Services at Schlumberger. Mr. Conkle has a Bachelor of Science degree in Petroleum Engineering from Marietta College.

Mr. Robert J. Willette has been Vice President, General Counsel, Corporate Secretary & Chief Compliance Officer at CARBO Ceramics Inc. since October 2017. Mr. Willette joined CARBO Ceramics in October 2017. He served as General Counsel and Corporate Secretary for Texon Distributing L.P. since beginning in 2009. From 2006 to 2009, he served as Corporate Counsel for Ferrellgas L.P.

Mr. Ernesto Bautista, III, has been the Chief Financial Officer and Vice President of CARBO Ceramics Inc. since January 20, 2009 and serves as its Principal Accounting Officer. Mr. Bautista served as the Chief Financial Officer of W-H Energy Services, Inc. since July 28, 2006; Vice President and Corporate Controller since June 2000 and also served as its Principal Accounting Officer and Assistant Secretary. From September 1994 to May 2000, he was employed at Arthur Andersen LLP serving in various capacities, as a Manager in the assurance practice, primarily focusing on emerging, high growth companies. He is a Certified Public Accountant. Mr. Bautista attended Rice University where he received Undergraduate degrees in Economics, Psychology and Managerial studies and a Master's of Accountancy.

Mark McGill serves as the Director of Sales and Marketing - Western Hemisphere of CARBO Ceramics Inc.. Mark started at CARBO Ceramics Inc. in September of 2012. Mark is currently based in the Houston, Texas Area.

Shannon Nelson serves as the Vice President of Manufacturing & Distribution of CARBO Ceramics Inc.. Shannon started at CARBO Ceramics Inc. in September of 2018. Shannon is currently based in the Houston, Texas Area.

Stephen Love serves as the Vice President: Industrial Technologies Division of CARBO Ceramics Inc.. Stephen started at CARBO Ceramics Inc. in February of 2016. Stephen is currently based in the Houston, Texas Area.