10 Arizona Public Service IT leaders
Chief Information Officer, Senior Director - Strategic Technology and Director, IT Enterprise Infrastructure are current titles held by these Arizona Public Service IT leaders, alongside directors of technology delivery, IT applications and customer solutions. A reader can learn how IT leaders work at APS from people who have held the role.
Professionals to explore
Aaron Greshko
LinkedInExperience: Director, IT Enterprise Infrastructure · Arizona Public Service - APS
Aaron Greshko has been Director, IT Enterprise Infrastructure at Arizona Public Service since February 2026, based in Phoenix, Arizona. Aaron Greshko was Director of IT Corporate Systems at Discount Tire from 2022 to 2025, Senior Manager - IT Corporate Systems there from 2021 to 2022 and Information Technology Strategy Manager in 2021.
Adrienne Manchas
LinkedInExperience: Director,Technology Delivery · Arizona Public Service - APS
Adrienne Manchas has been Director, Technology Delivery at Arizona Public Service since February 2025, based in Peoria, Arizona. Adrienne Manchas was Sr. Manager Solution Delivery, Information Technology at APS from 2022 to 2025, Business Unit Program Manager there from 2019 to 2022 and Manager Information Technology, Technology Portfolio Management from 2016 to 2017.
Amy Stec
LinkedInExperience: Director IT Customer Solutions · Arizona Public Service - APS
Amy Stec has been Director IT Customer Solutions at Arizona Public Service since October 2023, based in Homer Glen, Illinois, and describes a background as an IT leader in the utility industry. Amy Stec was Director IT, OCIO Strategy & Planning at Exelon from 2021 to 2023, Sr Manager, IT there from 2019 to 2022 and Manager, IT from 2016 to 2019.
Melanie Stuckenberg
LinkedInExperience: Director of Information Technology, Energy Solutions · Arizona Public Service - APS
Melanie Stuckenberg has been Director of Information Technology, Energy Solutions at Arizona Public Service since February 2026, based in Phoenix. Melanie Stuckenberg was IT Director - Strategy, Planning & Governance at APS from 2022 to 2026, IT Director - Infrastructure and Operations there from 2018 to 2022 and Director IT Infrastructure Operations & Engineering at PetSmart from 2017 to 2018.
Michael Melaragni
LinkedInExperience: Senior Director - Strategic Technology · Arizona Public Service - APS
Michael Melaragni has been Senior Director - Strategic Technology at Arizona Public Service since July 2022, based in Phoenix. Michael Melaragni was General Manager IT Applications at APS from 2018 to 2022, IT Director - Palo Verde Information Systems there from 2016 to 2018, Director - IT Applications Operational Technology from 2014 to 2016 and Director - IT Operations & Infrastructure from 2012 to 2014.
Michelle Ferrara
LinkedInExperience: Chief Information Officer · Arizona Public Service - APS
Michelle Ferrara has been Chief Information Officer at Arizona Public Service since October 2021, based in Phoenix, Arizona, and describes leading large multi-site operational support teams and delivering key IT projects. Michelle Ferrara was IT Vice President, Enterprise Wide Solutions at Exelon from 2018 to 2021, Director IT, Business Intelligence Data Analytics there from 2016 to 2018 and Director IT, Enterprise Technical Services at Exelon Generation from 2012 to 2015.
Paula Brockhoff
LinkedInExperience: Chief Technology Officer · Arizona Public Service - APS
Paula Brockhoff was Chief Technology Officer at Arizona Public Service from 2017 to 2018, a role that has ended, working in Phoenix, Arizona, and the profile now lists a retired IT utility executive role. Paula Brockhoff was VP Enterprise Support & Customer Operations at Tennessee Valley Authority from 2011 to 2017 and IT Director for Southern Power at Southern Company from 2008 to 2011.
Stacey Micatrotto
LinkedInExperience: Director, IT Applications · Arizona Public Service - APS
Stacey Micatrotto has been Director, IT Applications at Arizona Public Service since April 2024, based in Phoenix. Stacey Micatrotto was Director of Operations Support, Fossil Generation at APS from 2017 to 2024, Manager, CS Quality and Operations Support there from 2016 to 2017 and Operations Program Manager from 2014 to 2016.
Ted Geisler
LinkedInExperience: Chief Information Officer · Arizona Public Service - APS
Ted Geisler was Chief Information Officer at Arizona Public Service from 2018 to 2020, a role that has ended, and Chief Financial Officer there from 2020 to 2022. Ted Geisler has been Chairman, President and CEO at Pinnacle West Capital Corporation and Arizona Public Service since April 2025 and President at APS since May 2022.
Venkata Nimmala
LinkedInExperience: Director Digital Transformation & Enterprise Architecture · Arizona Public Service - APS
Venkata Nimmala has been Director Digital Transformation & Enterprise Architecture at Arizona Public Service since October 2024, based in Phoenix, with a profile headline citing AI strategy, enterprise data and technology modernization. Venkata Nimmala was Director IT Program & Project Delivery at APS from 2023 to 2024 and Director - Customer Solutions there from 2022 to 2023.
Choose the right perspective
Match the person's IT area, whether enterprise leadership, infrastructure, customer and energy solutions, applications, delivery or enterprise architecture, 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 IT role at Arizona Public Service?
- 02How do you balance operational technology for the grid and Palo Verde with corporate IT needs?
- 03What have you learned about modernizing customer systems at a regulated utility?
Reaching Arizona Public Service IT leaders
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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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