After opening up his home to The Coveteur, the writer and Warhol friend gives us another tour courtesy of NOWNESS and Apartmento magazine. Sharing his ambition to become a "grumpy old man," O'Brien's history has taken him from a staple in Warhol's Factory to becoming The Style Guy at GQ and now editor-at-large of Maxim. See what he owns and collects in the video above.