Frank Shepard Fairey is an American contemporary street artist, graphic designer, activist, illustrator and founder of OBEY who emerged from the skateboarding scene.
His work often reflects his support of promoting awareness of social issues and for this he has been criticised as well as acclaimed.
Fairey is not without his critics. A number of his fans were critical of the fact that he copyrights his work and profits from his work as an artist. As result there's a feeling he had lost his 'cult' status.
On the other hand, Fairey is well known as a promoter through his messages for political and social change and he donates heavily to many non profit making causes. He also argues that he relies on commercial profit in order to keep a staff of assistant artists in employment.
From a design point of view, I am a big fan. I like the graffiti, street art edge to the design. His prints can be purchased for anything from a few pounds to thousands of pounds.
I found these two and am on the hunt for more.