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2026 Nuclear Energy Conference & Expo (NECX)
August 24–27, 2026
Dallas, TX|Hilton Anatole
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Mark Peters: Building on a strong foundation
Summer at the American Nuclear Society carries with it a sense of renewed momentum as the incoming president takes office and starts making plans for the year ahead. This has been particularly true in the last few years, as nuclear energy moves into a new era marked by broader public interest, stronger policy support, and a growing sense of possibility across the field. Mark Peters, the Society’s 72nd president, shares that optimism—and he is focused on turning it into results.
2021 ANS Annual Meeting Plenary SPeaker
Jeff Guldner leads Pinnacle West Capital Corporation and its primary subsidiary, Arizona Public Service Company (APS). The companies are headquartered in Phoenix.
APS employs more than 6,000 people and serves nearly 1.3 million customers across Arizona. The company is among the nation’s top utilities for delivering clean and reliable energy to its customers and has announced an ambitious commitment to deliver 100% clean, carbon-free electricity to customers by 2050. APS operates the Palo Verde Generating Station, the nation’s largest energy producer—all of it carbon-free, and ranks among the top five investor-owned utilities for solar energy capacity.
Guldner was promoted to his current position in November 2019 from his dual roles as president of APS and executive vice president, public policy of Pinnacle West. Since joining APS in 2004, Guldner has held a number of leadership positions responsible for areas including legal, rates and regulation, government affairs and customer service.
Prior to APS, Guldner was a partner in the Phoenix office of Snell & Wilmer LLP, where he practiced public utility, telecommunications and energy law. Before practicing law, 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.
Guldner is dedicated to community involvement and actively serves on boards of directors, including the Partnership for Economic Innovation, the National Association of Manufacturers, Arizona Theatre Company and Greater Phoenix Economic Council, where he currently serves as Chair.
He earned a Bachelor of Arts degree from the University of Iowa and graduated magna cum laude from the Arizona State University College of Law. Guldner also completed the Reactor Technology Course at the Massachusetts Institute of Technology and the Advanced Management Program at Columbia Business School.
Last modified June 1, 2021, 8:23am EDT
