Detroit Medical Center CEO Mike Duggan sent and email to his employees at the DMC. The email was part gratitude and a description of the success under his leadership. Within the email he let the employees know that he would be stepping down as CEO on December 31st and the current President, Joe Mullany, will take over on January 1, 2013. He recruited Joe nearly a year ago, when he was serving as the head of Vanguard's Massachusetts system.