His web site is
www.advancedwholehorse.comI happened to know someone who had used Tommy Howell so I called him - his phone # is 765-401-6318. He travels several states: Indiana (where he lives), KY, TN, IL, Michigan, Georgia - pretty much anywhere but the farther he has to travel the more expensive it is. The cost for me was no more than what my vet would charge.
There is also Mike Frigale (sp???) who travels all around - I think he's based in Michigan. I believe if you contact Spencer they can give you a list of orthodontists and their phone numbers. Spencer will also travel to do your horses but he's more expensive. There are not a lot of them out there because Spencer only teaches 10 students per class and I think there are only 2 classes per year (and there are repeat students in those classes to learn advanced methods), and it takes a lot of hours to be certified. They want to make sure his people are fully qualified and not just someone who learns a few things and starts doing half ass work on horses' teeth. They are also trained in evaluating the whole horse - feet, muscles, etc - because they believe in treating the whole horse and recommending proper hoof care and body work if needed. They are extremely gentle and calming with the horses and rarely use sedation. I was shocked how calm my horses were - it's because they go slow and just do a little at a time, releasing the speculum every few minutes and using a variety of small hand tools made especially to fit in the horse's mouth. In most states, they cannot use sedation because only a licensed vet can administer, but the horse owner can administer the sedation or you can have your vet come out to sedate if you don't know how to do that. And they only believe in only using a small amount of sedation if any is required. I only had to lightly sedate 2 horses out of 12 and only because they kept holding their heads up too high - they like to do the work with the horse's head lowered so the jaw is in the proper position - they do much of the work on their knees.
Because they use special small hand tools, they are able to address the teeth needed rather than how indiscriminate power tools can grind away the wrong things and create the wrong angles. There are many horror stories out there where using power tools have permanently damaged the teeth.
I've heard there are many people in UK and Europe who want them to come over there but I don't know how those plans are progressing.