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Our leadership

The ISO is led by an experienced Board of Governors and executive management team that set policies that ensure the reliable performance of the high-voltage electricity grid, open access to participants, and a transparent, competitive market for energy.


Executive team

Executive biographies

Stephen Berberich, President and Chief Executive Officer
Keith Casey, Vice President, Market and Infrastructure Development
Roger Collanton, Vice President, General Counsel
Stacey Crowley, Vice President, External and Customer Affairs
Petar Ristanovic, Vice President, Technology
Mark Rothleder, Vice President, Market Quality and California Regulatory Affairs
Ryan Seghesio, Vice President, Chief Financial Officer and Treasurer
Eric Schmitt, Vice President, Operations
Jodi Ziemathis, Vice President, Human Resources


Board of Governors


Click here to go to the Board of Governors webpage.


Energy Imbalance Market Governing Body



Click here to go to the Energy Imbalance Market Governing Body webpage


Incorporation documents and policies

The ISO is a nonprofit public benefit corporation operating under these bylaws, incorporation documents and enabling legislation. Our employees and the Board of Governors are subject to clear and well defined codes of conduct and policies.