Randy Baze has worked on several horses at my previous barn. The barn owner has known him for many years and calls him as needed.
While I haven't used him myself, I've seen him work on her horses. He's patient and seems very thorough.
He grew up in a horse racing family - father trains, brother is a famous jockey. He himself rode until he grew too tall. So he definitely knows horses!
He has a human practice in south King County, and also does a fair amount of work at Emerald Downs.