Bill Clinton is stuck on him. Jon Stewart can’t get enough. Even former Yankees pitcher Mike Mussina goes gaga over his work. So just who is Will Shortz? Take a look at almost any puzzle book, and chances are you’ll find The New York Times’ longstanding crossword editor’s name on the spine. In addition to his day job, he’s authored or edited more than 400 puzzle books, is founder and director of the American Crossword Puzzle Tournament, and is a regular on-air contributor to NPR’s Weekend Edition Sunday. Despite the fact that he can finish The New York Times’ Friday and Saturday puzzles in 15 minutes, Shortz is refreshingly unpretentious.