Albert Watson does not shoot quickly. In an era defined by the speed of the digital shutter, when photographers talk of "capturing" a moment as though the moment were a bird that might escape, Watson prefers to wait. To think. To construct. His portraits are not captures; they are architectures.

"Every person has one image that is uniquely, irreducibly them. My job is to find it."

It is a philosophy that has produced some of the most recognisable images of the twentieth and twenty-first centuries. The Steve Jobs portrait — taken in 1982, when Jobs was twenty-six and Apple was just beginning to understand what it might become — is among the most reproduced photographs in the world.