10 Arizona Public Service operations leaders
Chief Operating Officer, Senior Vice President Operations and Senior Vice President Nuclear Site Operations are current titles held by these Arizona Public Service operations leaders, alongside leaders of operations support, transmission and distribution, generation and site services. A reader can learn how operations leaders work at APS from people who have held the role.
Professionals to explore
Cary Harbor
LinkedInExperience: Senior Vice President Nuclear Site Operations · Arizona Public Service - APS
Cary Harbor has been Senior Vice President Nuclear Site Operations at Arizona Public Service since January 2024, with a profile headline citing the Palo Verde Nuclear Generating Station. Cary Harbor was Vice President, Nuclear Regulatory & Oversight at APS from 2022 to 2023 and Sr. Director - Diablo Canyon Power Plant Station Director at Pacific Gas and Electric Company from 2019 to 2022.
Drew Tranberg
LinkedInExperience: Director Distribution Operations and Maintenance · Arizona Public Service - APS
Drew Tranberg has been Director Distribution Operations and Maintenance at Arizona Public Service since December 2023, based in Phoenix, and describes managing distribution supervisors, operators and customer communications specialists toward a best in class operations model. Drew Tranberg was IT Director of Energy Solutions at APS from 2018 to 2023 and Operations Manager there from 2014 to 2016.
Jacob Tetlow
LinkedInExperience: Chief Operating Officer · Arizona Public Service - APS
Jacob Tetlow has been Chief Operating Officer at Arizona Public Service since October 2024, based in Mesa, Arizona. Jacob Tetlow was Executive Vice President Of Operations at APS from 2021 to 2024, Sr Vice President of Operations (non-nuclear) there from 2020 to 2021, Vice President, Transmission and Distribution from 2017 to 2020 and General Manager Transmission and Distribution Operations and Maintenance from 2014 to 2017.
John Hernandez
LinkedInExperience: Vice President, Site Services · Arizona Public Service - APS
John Hernandez has been Vice President, Site Services at Arizona Public Service since October 2022, based in the Greater Phoenix Area. John Hernandez was Director, Plant Engineering at APS from 2021 to 2022, Director, Controls and Innovation Engineering there from 2019 to 2021 and Department Leader, Operations Computer Systems from 2018 to 2019.
Mackenzie Rodgers
LinkedInExperience: Vice President, Transmission and Distribution · Arizona Public Service - APS
Mackenzie Rodgers has been Vice President, Transmission and Distribution at Arizona Public Service since June 2025, based in Phoenix, Arizona. Mackenzie Rodgers was Sr. Director Transmission and Distribution Operations and Maintenance at APS from 2024 to 2025, Director of Transmission Operations and Maintenance there from 2023 to 2024 and Northern Arizona Division Director from 2021 to 2023.
Mark Schiavoni
LinkedInExperience: COO · Arizona Public Service - APS
Mark Schiavoni was COO at Arizona Public Service from 2014 to 2018, a role that has ended, and EVP Operations at APS from 2013 to 2014 and SVP Generation there from 2009 to 2013. Mark Schiavoni was President Exelon Power at Exelon from 2004 to 2009, and the profile now lists Retired, based in Paradise Valley, Arizona.
Michael Kohrt
LinkedInExperience: Vice President, Generation · Arizona Public Service - APS
Michael Kohrt has been Vice President, Generation at Arizona Public Service since December 2023, based in Buckeye, Arizona. Michael Kohrt was Senior Director of Gas and Oil Generation at APS in 2023, Director - Transmission Operations and Maintenance there from 2020 to 2023 and Director - Palo Verde Unit 3 Assistant Plant Manager from 2018 to 2020.
Tony Tewelis
LinkedInExperience: Senior Vice President, Energy Delivery & Large Customer Projects · Arizona Public Service - APS
Tony Tewelis has been Senior Vice President, Energy Delivery & Large Customer Projects at Arizona Public Service since February 2026, based in Phoenix, and also lists Senior Vice President, Transmission & Distribution Operations there since 2024. Tony Tewelis was Vice President, Transmission & Distribution Operations at APS from 2020 to 2024 and General Manager, T&D Operations & Maintenance from 2018 to 2020.
Traci Stooks-Dermer
LinkedInExperience: Vice President, Operations Support · Arizona Public Service - APS
Traci Stooks-Dermer has been Vice President, Operations Support at Arizona Public Service since March 2022, based in Phoenix, Arizona. Traci Stooks-Dermer was Director, Facilities, Corrective Action Program / Human Performance & Water Resource Management at APS from 2013 to 2022 and Manager, Finance & Business Operations there from 2001 to 2013, and was an Investment Banking Analyst at CIBC Capital Markets.
William Edward Mojica
LinkedInExperience: Senior Vice President Operations · Arizona Public Service - APS
William Edward Mojica has been Senior Vice President Operations at Arizona Public Service since March 2026, based in the Greater Phoenix Area. William Edward Mojica was Senior Vice President of Gas Operations at NiSource from 2024 to 2026 and SVP, Utility Ops. Support & Technical Services there from 2020 to 2024, and was Engineering Supervisor/Portfolio Manager for coal power plants at APS from 2011 to 2012.
Choose the right perspective
Match the person's operations area, whether company-wide operations, nuclear generation at Palo Verde, gas and oil generation, transmission and distribution, or operations support, to the decision you face. Check when each person started their current role, or when a past role ended, to judge how recent their view of it is.
Questions to take into the conversation
- 01What did you focus on first when you took on your operations role at Arizona Public Service?
- 02How do you plan transmission and distribution work around extreme summer heat and peak demand?
- 03What have you learned about keeping generation fleet reliability high while adding new resources?
Reaching Arizona Public Service operations leaders
How can I contact one of these Arizona Public Service operations leaders?
Pick one of the 10 people on this page and choose "Book a paid call", or describe your project to find others. You offer a fee for a 15-minute call or a written answer, Instant Expert finds the person's work email and sends the invitation, and they decide whether to accept. The list covers 1 company: Arizona Public Service - APS, based on profile data retrieved on October 24, 2026. Being listed here doesn't mean someone has agreed to take calls.
How much does it cost to reach Arizona Public Service operations leaders?
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Can an AI agent ask one of these Arizona Public Service operations leaders a question?
Yes. An agent with a USDC wallet on Base can ask one question without an Instant Expert account. It names the person, for example by the LinkedIn URL on this page, and pays per ask over x402 (HTTP 402). The person answers in writing or by voice note, and if nobody answers within 7 days, the payment goes back to the wallet automatically. Claude and ChatGPT can do the same through the Instant Expert connector: setup is at /docs/mcp for Claude and /docs/chatgpt for ChatGPT. x402 docs
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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