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Jonathan W. Thayer

Senior Executive Vice President and Chief Financial Officer, Exelon Corporation


Jonathan (Jack) W. Thayer joined Exelon Corporation in January 2012 and serves as senior executive vice president and chief financial officer.  As the chief financial officer, he is responsible for overseeing the execution of all financial activities including the capital investment process, cost optimization, financial reporting, planning, audit and tax. Additionally, in his role, Thayer leads the treasury function in developing and implementing financing plans as well as the investor relations department.


Professional History

​Prior to joining Exelon, Thayer was appointed Senior Vice President and Chief Financial Officer of Constellation Energy in October 2008. Thayer joined Constellation Energy in 2003, at which time he served as Director, Investor Relations, responsible for managing Constellation Energy's relationships with shareholders and analysts. In 2004, he was appointed Vice President and Managing Director, Corporate Strategy & Development, responsible for strategic transaction execution and planning. He was appointed Treasurer in August 2008.

Prior to joining Constellation Energy, Thayer held financial positions at Deutsche Bank Securities Inc. and SBC Warburg Dillon Read Inc., primarily focusing on mergers and acquisitions and financing transactions within the health care services, medical technology, biotechnology, and pharmaceuticals industries. 

Thayer served as a project officer in Mukono, Uganda from 1994-1995. He managed the Ugandan AIDS Project operations, including development and implementation of palliative AIDS care programs and implementation of administrative, training and supply networks for the Church of Uganda's rural health care initiative.​

Civic Involvement

Thayer was the Chairman of Constellation Energy's 2006 and 2007 United Way Campaign and is a former Board member of The United Way of Central Maryland. He previously served as a Board member of Family and Children's Services of Central Maryland and the Boy Scouts of America, Baltimore Area Council. He is currently a trustee of the Gilman School, a member of the Posse Foundation’s Chicago Advisory Board, the Robert Toigo Foundation Board, and the Rush University Medical Center Board. ​



Thayer earned a bachelor's degree in history from Middlebury College, cum laude, and a master's degree in business administration from Harvard University. He has also earned the title of Eagle Scout.



Thayer is married and has two children.