This is an exhibition at The National Portrait Gallery, that runs until 6 June. It documents his work from the late 40's the 2007 and there is a very definite change in style during that period. His earliest work features full-length shots of very famous sitters posing on old pieces of carpet and wedged in alcoves - it's quite bizarre.
He then made a transition to headshots which became more dynamic as time passed.
The quality of the images is outstanding and I found it personally enlightening to see what people like Rogers and Hammerstein actually looked like. It seems that anyone who was anyone, was photographed by Irving Penn!