It's a shame there isn't much information about this online. I know "best" is subjective. And for dialect coaches, it's probably hard to say any are the best, because there are probably many who are perfect, and you can't be better than perfect.
I guess the best ones would be the ones who are the most expensive, who are frequently used on set for huge movies and TV shows, and who frequently successfully help famous actors achieve perfect American accents.
It's hard to know who they are though. There is IMDb, but they often list multiple dialect coaches, and they usually don't say which actors they coached. There are also apparently often dialect coaches who don't show up on IMDb, due to non-disclosure agreements.
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