Influential doesn't always mean universally excellent. Which is why Cindy Sherman is high on the list. If you look at flickr stuff, she is influential... I still don't know why. Maybe lotsa women art teachers like her or something.

I'd say Clarence H White is missing from the list. He was a well respected photographer at the time of pictorialism and went on to teach the who's who of modern photography. Influential in more ways than making images.

I'm also surprised there is no Karsh on the list.