Exelon Corporation announced the next level of executives leading what will be the largest competitive energy provider in the nation upon the closing of Exelon's merger with Constellation Energy Group. The appointments reflect leaders who will assume senior leadership roles in the combined organization, effective upon closing. They follow prior announcements of senior leadership within the Constellation business unit and the Exelon risk and finance teams. Reporting to Charles G. (Chip) Pardee, who will remain senior vice president and COO of Exelon Generation, at the senior vice president level will be Ron J. DeGregorio, currently chief integration officer for Exelon, who will become senior vice president, Exelon Generation, and president of Exelon Power Michael J. Pacilio, currently senior vice president, Exelon Generation, president of Exelon Nuclear and chief nuclear officer, who will remain in that role and Amir Shahkarami, currently senior vice president, Exelon Generation, and managing director, Exelon Nuclear Partners, who will remain in that role. Reporting to DeGregorio at the senior vice president level will be John F. Barnes, currently vice president, Power Operations, for Exelon Power, who will become senior vice president, Exelon Generation, and COO of Exelon Power and John T. Long, currently president of Constellation Power Generation, who will become COO for Maryland Clean Coal. Remaining in their current roles and reporting to Pacilio at the senior vice president level in Exelon Generation will be Joseph P. Grimes, senior vice president, Engineering and Technical Services; Bryan C. Hanson, senior vice president, Midwest Operations; Susan R. Landahl, COO, Fleet Operations and Christopher H. Mudrick, senior vice president, Mid-Atlantic Operations. In addition to the changes announced above, current Exelon executives Victor Fonseca, senior vice president, Compensation and Benefits; Daniel C. Hill, senior vice president and chief information officer and John R. Samolis, senior vice president, Human Resources have announced their intent to retire upon closing of the merger.