Portraiture, one of the oldest and most captivating photographic genres, has roots dating back to the earliest days of the medium. Compiling a list of its most significant exponents is a daunting task, but this is what we've endeavoured to do: select what we consider the best portrait photographers of all time, each of whom has left an enduring mark on the style.

Paris Photo, the world’s leading art fair dedicated to photography, returns for its 27th edition with a packed schedule in the heart of the French capital.