"Dennis stepped into the role of president and provided leadership during a challenging period, and I am very grateful to him for the job that he has done and for the many contributions that he has made to the organization," McCourt said.
"I greatly appreciate the opportunity that Frank gave me to serve as president for what is one of the premiere organizations in all of sports," Mannion said. "It has been a tremendous experience, and one that I will cherish as I continue my career in professional sports."
Mannion joined the Dodgers nearly three years ago as chief operating officer and was promoted to president/chief operating officer in March 2009. He came to the Dodgers from the Baltimore Ravens of the NFL.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.