Not sure how many , but he has been doing them for about 18 months. However, he has been doing ablations of other things for many years. He spoke very highly of the precision the TULSA system gives him.
Also found this online before my TULSA. A few years old but still valid for experience:

Focal therapy for the prostate began in the late 1990s; however, there is a very limited number of providers who are trained and skilled enough to perform this procedure. These 5 doctors have the most experience and have performed the most Focal Laser Ablation procedures:

Myself — Eric Walser, MD of Wavelength Medical by UTMB (Galveston, TX)
Dan Sperling, MD of Sperling Prostate Center (Boca Raton, FL)
Jurgen Futterer, MD, PhD of Radboud (The Netherlands)
David Woodrum, MD, PhD of Mayo Clinic (Rochester, MN)
John Feller, MD of Desert Medical Imaging (Indian Wells, CA)

Your situation sounds very similar to mine. Would you share some additional details about your cancer? I have one lesion, about 1 cc. Gleason 3+4, right anterior, mid-gland, less than 5-10% pattern 4. Only 1 of my 13 core samples in a prostate of 100cc came back positive. My only down side is a Decipher Score of 0.78. Mayo, MN radiation oncologist suggested 4 mos. ADT + SBRT. They were "on the fence" regarding ADT. At that time I said no to ADT. I had a phone consult with Dr. Woodrum following that. I've opted for TULSA-PRO and will have the procedure in early October. I've opted for focal therapy because Dr. Woodrum said the chances of the cancer returning no matter the procedure (surgery, radiation, focal therapy) are about the same (15-20%), although the radiation oncologist took issue with FT and said because prostate cancer is multi-focal in nature there is greater likelihood of it returning somewhere else in the untreated part of the prostate. My thought process however is, if it does return, I still have all of the treatment modalities available to me for treating it. I'm not sure that's the case if radiation is used, or if it's so easily achievable. I hope I'm making the right decision.