This is from a while ago, but I was thinking about Dr. Kotler due to problems I'm having with a root canal from another dentist, and wishing I had seen Kotler for it. Oh well. And now I come on this site and see there aren't any reviews for him.
In any case he did an excellent job on a front upper incisor under urgent care circumstances, charging less than general dentists in the area and doing a better job. Almost 12 years later, the root canal is still as good as new, with absolutely no sensitivity. In contrast the one I had done at a general dentist a year later -- in which the dentist MISSED one of the channels and I had to go back to a specialist endodontist to fix (unfortunately I had moved away and couldn't use Dr. Kotler) -- is showing sensitivity that I hope like heck is confined to the gum. If it's in the tooth it will be hugely expensive to deal with as it is a rear tooth with a gold crown.
I highly recommend Dr. Kotler -- and just in general I would absolutely have root canal work done at a specialist and not by a general dentist under any circumstances.