Anne Wolfe. Her training messed up James Kirkland in the long run, his body deteriorated extremely fast. She taught absolutely No head movement, no jab or proper punch placement. Basically mindlessly kill your body for 8 weeks during training camp and hope your toughness wins you fights. It worked a few times for what it’s worth, but it was only a matter of time until someone was going to expose his defensive flaws, who knew it would be the light hitting ishida. Other than Kirkland I can’t name another boxer in which she successfully trained and for good reason.
McCracken helped AJ beat Klitschko, Parker, Povetkin, Ruiz, Pulev. He's not a bad trainer. Johnathon Banks is.
Mccracken is a proven, top trainer Froch - unified champ, future HOF'er, and british ATG Joshua - unified champ & loads of medals at major championships as the GB head coach
Probably already been mentioned, but those clowns who trained Tyson. You know, the guys who put the balloon on his swelling instead of an endswell. I think one of them was named Aaron Snowell, and the other guy was Rory Something or Other! Jokes, both of them.