This week, Sir Alex Ferguson, one of the most successful coaches in recent years, inhabiting the same rarefied air as other legends like Phil Jackson and Mike Krzyzewski , retired from his post at Manchester United. Ferguson had served as manager at Old Trafford for twenty-seven seasons and captured thirteen English league titles, two Champions League trophies and countless cups. Since 1986, other rivals have come and gone while United has remained at the top, providing an example that other coaches around the world can follow.