I remember seeing him at the first worldcon I ever attended, Boston's in 1980. It took a few worldcons before I could get him to autograph anything because the lines were always so darn long. At that first worldcon's autograph session, I eventually noticed that the person right behind me was writer Patricia McKillip. While I was chatting with her, her fellow writer Ellen Kushner showed up and, upon seeing my French edition of I, Robot, with its photo of a young Asimov, exclaimed "He looks like Clark Kent!"

Come to think of it, was the Good Doctor ever seen anywhere near kryptonite?