Diane Duren - US Silica Independent Director

Ms. Diane K. Duren is Independent Director of the Company. Ms. Duren retired from Union Pacific Corporationrationration, the operator of one of North Americans premier railroad franchises, having served as Executive Vice President, Chief Administrative Officer and Corporationrationrate Secretary for four years, after serving as Vice President and General ManagerChemicals in Marketing Sales. Since joining Union Pacific in 1985, she held a variety of positions in the Finance and Marketing Sales departments, including Vice President and General ManagerAgricultural Products. In 2012, Ms. Duren was one of the honorees of the Womens Center for Advancement Tribute to Women. She was recognized by Profiles in Diversity Journal as one of the Women Worth Watching in 2011, and that same year, she was awarded the Creighton University College of Business Alumni Merit Award. In 2008, Ms. Duren was recognized by Pink magazine, a magazine for professional women, as one of the top 15 women in business. Prior to her employment at Union Pacific, she was a certified public accountant with Deloitte, Haskins Sells in Omaha. Ms. Duren has served as a director of Werner Enterprises, a transportation and logistics company, since May 2017. She was active on multiple community and industry boards including Girl Scouts Spirit of Nebraska and American Red Cross, of which she served as chair of the Heartland Chapter in 2010 and 2011. In 2014, Ms. Duren was appointed by Omaha Mayor Jean Stothert and reappointed for another fiveyear term beginning May 2019 by the Omaha City Council to the Metropolitan Entertainment Convention Authority Board of Directors and is the current Chairwoman of the Board. She also serves on the Board of Childrens Hospital and Medical Center as Chair. Ms. Duren joined the Peter Kiewit Foundation as a community advisor in December 2018. Ms. Duren holds a bachelors degree in Business Administration from Creighton University. Ms since 2017.