Agree with the Cobra 100% Perhaps these four are the top trainers of all time. I would add Cus D'Amato, Whitey Bimstein and Lou Duva to this list as well.
Thanx big cat, much respect for mentioning Kenny Adams as well. He was and is one of the best trainers of the past 20 years right beside Freddie Roach and Don Turner.
Cristobal Rosas. Its no coincidence that he trained the two best fighters out of mexico Chavez and Sanchez.