Shirley A. Baum serves as Senior Vice President and General Counsel for Pinnacle West Capital Corporation (PNW) and its principal subsidiary, Arizona Public Service Company (APS). In this pivotal role, she leads the company's legal department, providing strategic guidance on a wide array of matters including regulatory compliance, corporate governance, litigation, commercial contracts, and risk management. Baum plays a key role in supporting PNW and APS's mission to deliver reliable, affordable, and sustainable energy to Arizona customers, navigating complex federal and state regulations in the evolving utility sector. With over 25 years of experience in the energy industry, Baum joined Pinnacle West in 2000 after holding senior legal positions at Southern California Edison, where she specialized in regulatory affairs, environmental law, and utility operations. She earned her Juris Doctor from the UCLA School of Law and her Bachelor of Arts from the University of California, Berkeley. Admitted to practice in both Arizona and California, Baum has been instrumental in shaping legal strategies that have facilitated major initiatives, such as the integration of renewable energy sources and grid resilience projects. Under Baum's leadership, the legal team has achieved notable successes, including favorable outcomes in high-stakes regulatory proceedings before the Arizona Corporation Commission and the Federal Energy Regulatory Commission. She is a recognized leader in promoting diversity and inclusion within the legal profession, serving on the boards of several industry organizations and earning accolades such as the Arizona Corporate Counsel of the Year award. Baum's expertise continues to drive Pinnacle West's commitment to ethical governance and innovation in the clean energy transition.