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.