After 27 years, 13 Premier League titles and two Champions League trophies, the most successful manager in the history of English football, despite being from Scotland, is retiring. The rumors have been whirling around Manchester United and Alex Ferguson for the last 12 hours, and the manager could no longer avoid the questions and the doubts, confirming this season will be his last at the helm of the club he turned into the most successful in England and one of the strongest in Europe.