This Chun fellow could be very dangerous if we didn't all know that academic blurbs are written by university administrations and forced on unwilling shy and retiring academics.
That said, I genuinely believe that some of my colleagues really are the leading authorities on certain things. But better not to name names.
http://www.google.com/search?num=100&hl=en&lr=&ie=UTF-8&safe=active&c2coff=1&q=%22the+nation%27s+leading+authority%22+site%3Aduke.edu++&btnG=Search