Jeffrey Guldner most recently served as President and Chief Executive Officer and Chairman of the Board of Directors of Pinnacle West Capital Corporation, a utility holding company, and Chief Executive Officer and Chairman of the Board of Directors of its primary subsidiary, Arizona Public Service Company (APS), an electric utility company, from November 2019 to March 2025. He also served as President of APS from August 2021 to May 2022. Mr. Guldner joined APS in 2004 and held several leadership positions at APS prior to his current roles. Prior to joining APS, Mr. Guldner was a partner in the Phoenix office of Snell & Wilmer LLP, where he practiced public utility, telecommunications and energy law. Before practicing law, Mr. Guldner served as a surface warfare officer in the United States Navy and was an assistant professor of naval history at the University of Washington. Mr. Guldner serves on the Board of Directors of Duke Energy Corporation, a publicly traded corporation, the McCain Institute, and the Smart Electric Power Alliance. Mr. Guldner holds a B.A. from the University of Iowa and his J.D. from Arizona State University College of Law. Mr. Guldner is also a graduate of the Reactor Technology Course at the Massachusetts Institute of Technology and the Advanced Management Program at Columbia Business School. MR. GULDNER WAS SELECTED TO SERVE AS A DIRECTOR ON OUR BOARD BASED ON HIS EXTENSIVE INDUSTRY, MANAGEMENT AND PUBLIC COMPANY EXPERIENCE.