Tudpock18 has recommended Dr. Wm. Figlesthaler. I agree that Dr. Figlesthaler and his partner, Dr. Micheal De'Angelo, have good reputations as DaVinci specialists here in SW Florida. As a matter of fact, Dr. Figlesthaler performed my DaVinci RP in 12/2008.
However, you are asking on behalf of your 65 yr. old father with a Gleason 6 (about my age and stats at the time of my RP). I understand your logic about removing the offending organ. But, it will be your father who will experience the consequences, both good and bad. For instance, post-RP I am totally incontinent and have complete ED; not a very pleasant consequence. Is your father ready and willing for such a possible outcome?
I do suggest that your father not be rushed, and explore to his satisfaction all of his alternatives, including AS. By mentioning these things, I am not recommending one approach over another --- that should be for your father to decide based upon his true feelings and his then present medical condition.