Colin Marshall talks to Geoff Dyer, the "intellectual gatecrasher" who has written, in addition to several novels, books on photography, World War I, jazz, John Berger, travel, and D.H. Lawrence. His essays turn out to cover an even wider span of subjects than his books, and his latest collection Otherwise Known as the Human Condition includes pieces on Susan Sontag, Def Leppard, Ian McEwan, avoiding real jobs, Richard Avedon, Editions of Contemporary Music, W.G. Sebald, growing up an only child, and the search for the perfect donut and cappuccino.