I was his patient a few years ago. I had a craniopharyngioma (basically, a calcified pituitary tumor), and he performed a craniotomy to remove it.
I don't know if he handles more spine/back cases than head cases, but he did a nice job with my surgery. I say this because craniopharyngiomas tend to return within one year after they are removed. My surgery was eight years ago, and I am still tumor free!