Dr. Telian is a stellar doc - great reputation, very experienced, and very personable (I met him @ the 2009 ANA Symposium in Chicago). Not to discount him, but there are lots of docs who are comparable and some might even argue better, based on their personal experience. I can think of several phenomenal docs off the top of my head - Brackmann & Friedman @ HEI, Tew in Cincinnati, Wiet (Richard) in Chicago, Roland & Golfinos in NYC, etc. Many, many more. And I'm sure that those of us on the Forum who had a positive result with our docs would add their name to the list - I wouldn't hesitate myself.
I'm not sure there are any statistical studies to support a 80% success rate for Dr. Telian - and I have to ask success rate of what? Positive outcomes? Complete tumor removal? Patients who didn't have CSF leaks? In other words, what defines "success"?
A good place to start when searching for experienced, qualified docs who treat ANs is the main page of this website. Check out the tab titled "Medical Resources", which lists both individual doctors and medical facilities that, although not recommended by the ANA, have passed a set of standards that the ANA subscribes to when treating ANs. The medical centers listed are all considered to be ANA Centers of Excellence.
This is not to say that docs and/or medical facilities not listed on the main page aren't qualified, aren't experienced, or should be avoided, but it's a great place to start for those trying to find the best resources.