Brian X. Tierney is President and CEO of FirstEnergy Corp. He also is a member of the company’s Board of Directors.
Previously, Brian was a Senior Managing Director and Global Head of Operations and Asset Management for Blackstone Infrastructure Partners.

Prior to joining Blackstone in 2021, Brian spent more than
23 years at American Electric Power (AEP), one of the largest electrical utilities in the United States. He held a number of senior leadership positions at AEP, most recently serving as Executive Vice President of Strategy. From 2009-2020 Brian served as Executive Vice President and Chief Financial Officer. As CFO, Brian directed the company’s finance and accounting activities, and also had responsibility for strategy, procurement, supply chain and fleet operations. Tierney gained operations experience as Executive Vice President – AEP Utilities East, AEP’s largest regulated utility region, responsible for the distribution, customer service, and financial performance of AEP’s utility operating companies in the states of Indiana, Kentucky, Michigan, Ohio, Tennessee, Virginia and West Virginia. Earlier in his career, Brian worked for a subsidiary of Enron Corp.

Before entering the energy industry, Tierney served as a United States Peace Corps Volunteer in the Republic of the Philippines and worked in the consumer products industry.

Tierney has a Bachelor of Arts in History from Boston College and an MBA from the University of Chicago with concentrations in finance and accounting. He currently serves on the board of the Edison Electric Institute (EEI).