Mary Ellen Mark is an American photographer known for her photojournalism, portraiture, and advertising photography. She has had 16 collections of her work published and has been exhibited at galleries and museums worldwide.
Vivian Maier was a prolific street photographer. There was a really interesting documentary about her life, Finding Vivian Maier.
Eric Kim is a street photographer who has a really solid blog with great tips.
Clayton Hauck does an amazing job of capturing the energy of his subject. He takes shots throughout my hometown of Chicago as well.
His site is at: http://claytonhauck.com/
Great use of light for my friend and DJ Major Taylor.