Best being a relative term here, but I believe this forum gets what I'm getting at (perhaps top 10.) I was just pondering some of this today and decided to run it past Google's AI to see what it would come up with.
here are the results from the Google AI
Mills Logan
A Grammy award-winning immersive mix engineer who has mixed over 600 songs in Dolby Atmos at his Nashville studio.
Stan Kybert
A UK-based Atmos mixer who specializes in immersive music.
Andy Bradfield
A leading mix engineer who has shared lessons learned about Dolby Atmos.
Greg Wells
A Canadian super-producer who has created real-world Atmos content.
Mert Özcan
A Los Angeles-based recording and mix engineer who was among the first to explore Dolby Atmos music creation.
Leslie Mona-Mathus
A two-time Emmy award-winning audio mixer, sound designer, and producer who has also won multiple Clio and Promax awards, an Independent Music Award, and a Gold Record.
Nathaniel Reichman
A Grammy award-winning immersive mix engineer who worked on John Luther Adams' orchestral piece Become Ocean.
Richard Chycki
A multi-platinum mixer and engineer who has worked with clients such as Rush, Aerosmith, and Dream Theater.
*Seems there are a lot of holes in this list.