On January 26, 2018, Terry L. Nutt resigned in his capacity as Senior Vice President and Controller and the principal accounting officer of Vistra Energy Corp. to accept a new career opportunity. Mr. Nutt's departure was not the result of any disagreements with the company regarding accounting, financial reporting, operations, policies, practices or otherwise. Effective January 26, 2018, Christy Dobry was appointed by the board of directors of the company as Vice President and Controller and assumed the duties of principal accounting officer. Ms. Dobry has served as the company's Senior Director of Corporate Accounting since October 2011; she previously served as Accounting Manager for Luminant Energy Company LLC from July 2008 to October 2011.