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Diane K. Duren has served as a member of our Board since September 2021. In February 2017, Ms. Duren retired from Union Pacific Corporation, one of North American’s premier railroads, having served as Executive Vice President, Chief Administrative Officer, and Corporate Secretary for four years. Since joining Union Pacific in 1985, she held a variety of positions in the Finance and Marketing & Sales departments, including leading two of the company’s business units, first as Vice President and General Manager—Agricultural Products, and then as Vice President and General Manager—Chemicals.

Ms. Duren has served as a director of Werner Enterprises, a transportation and logistics company, since May 2017, and as a director of U.S. Silica Holdings, Inc., an industrial minerals company, since August 2017, and she currently serves as the chair of each company’s compensation committee and as a member of each company’s audit committee.

Ms. Duren holds a bachelor’s degree in Business Administration from Creighton University, and she was appointed to the Board of Trustees of that university in May 2019.