Last September, when nearly all the world’s leaders were in New York for a meeting of the United Nations, Avedon Platon, a staff photographer for The New Yorker set up a tiny studio off the floor of the General Assembly, and tried to hustle as many of them in front of his lens as possible. For months, members of the magazine’s staff had been writing letters to various governments and embassies, but the project was a five-day-long improvisation, with Platon doing his best to lure the likes of Mahmoud Ahmadinejad, Hugo Chávez, and Muammar Qaddafi to his camera.