I had Geoff highly recommended, but he would not come as far as Chester Springs the last time I tried a few years ago. If you run into the same problem, I use Gail Emerson 610-593-3353 and am very happy. No power tools, but still gentle and allows them to keep their heads low. My horses need very little tranq with her. A bit of a character, but shows up on time, calls to set up an appt at the agreed upon interval and she teaches hand floating for the IAED.
There is one equine dentist in this area (not mentioned here) that you do not want.
A friend of mine switched from Gail to Dr. Tony Rodriguez. Her horses were in their mid twenties and Gail said she does not work on untranq'd horses. Friend was not comfortable tranquilizing horses that old without the vet. She figures that if the vet is coming out he may as well do the float.
He apparently does a lot of floats and is good at it.
I use Mark Cheshire. Our whole barn pretty much uses him. I have been happy.
Oh, well, clearly you're not thoroughly indoctrinated to COTH yet, because finger pointing and drawing conclusions are the cornerstones of this great online community. (Tidy Rabbit)