Marcus Bleasdale (born 1968) is a photojournalist, born in the UK to an Irish family. He spent over eight years covering the brutal conflict within the borders of the Democratic Republic of Congo and has worked in many other places. Much of his work is linked to fundraising for aid and human rights agencies and there is often a link to ways t donate. His videos are extremely powerful and also discuss what people can do to change the situations the are seeing.
His images are in both black and white and colour and he also does video. They get their power because he is well informed about what he is shooting and knows why he wants hat shot and also has access to people and situations most outsiders would not. But he also has an extraordinary sense of composition and tone. Some of his images at composited (no examples available for download) but I generally find these less powerful.
Rape of a Nation. http://mediastorm.com/publication/rape-of-a-nation