As previously disclosed by Nuverra Environmental Solutions, Inc. on its Current Report on Form 8-K filed with the Securities and Exchange Commission on October 25, 2019, Stacy W. Hilgendorf resigned as Vice President and Chief Financial Officer of the Company, effective as of November 7, 2019, to assume a senior financial position with another company in an unrelated industry. Effective as of November 29, 2019, the board of directors of the Company appointed Charles K. Thompson, the Company's current Chairman of the Board and Chief Executive Officer, to serve as interim Chief Financial Officer. Mr. Thompson will also serve as the Company's principal financial officer.

Mr. Thompson's biographical information and business experience, as required by Items 401(b) and (e) of Regulation S-K, were previously disclosed in the Company's Proxy Statement filed with the SEC on April 30, 2019. Effective as of November 29, 2019, Christine Kline, the Company's current Director of Financial Reporting, assumed the role of principal accounting officer of the Company. Ms. Kline has served as the Company's Director of Financial Reporting since July 2015.

Prior to joining the Company, Ms. Kline served as Director of Accounting & Reporting of PetSmart, Inc. from October 2007 until July 2015.