Tiger it depends for what reason you need him.
Dr. Bahn is reputable for his work with biopsies. He also specializes in cryotherapy and immunotherapy. I know a couple men that have seen him from my UsTOO group in Las Vegas and they liked him for their cryotherapy. I would note that both eventually had biochemical relapse and this is consistent with studies showing that cryotherapy is less effective in intermediate/high risk cases.
I met Dr. Bahn in 2009 at the PCRI meeting, which he is a regular speaker at, and he did this interview with the group I was representing:
www.youtube.com/watch?v=_yVinncQJH4Dr. Bahn is a board certified radiologist in California. To my knowledge his primary specialty is cryotherapy and color doppler biopsies. I will see him again in September at the 2011 PCRI event.
Tony