Have you seen this website?  
http://genderoutlaw.wordpress.com/faq/ 🔗He lists a few surgeons that use the concentric circle technique.      
    Dr. Cameron Bowman – Vancouver, BC, Canada
    Dr. Christine McGuinn – Doylestown, PA, USA
    Dr. Daniel Medalie – Cleveland, OH, USA
    Dr. Beverley Fischer – Timonium, MD, USA
After doing some more reading on the ftmsurgeryinfo yahoo group, I'm willing to bet that a lot of surgeons use the technique but simply call it peri-areolar.  I think Dr Melissa Johnson in Springfield, MA and Dr Peggy Ching in CA are two more that use the concentric circle method.  I'm not sure about their exact techniques, but I think Dr Gary Alter in Beverly Hills, CA; Dr Michael Brownstein in San Francisco, CA; Dr Peter K Davis in Palo Alto, CA; and Dr Jed H. Horowitz Huntington Beach, CA/Newport Beach, CA also perform peri surgeries.
Also, peri-areolar concentric circle (PACC), donut, round block, double circle, and purse string seem to the same thing.  Don't quote me on that though; I'm far from an expert when it comes to peri.  Hope some of this info helps!