Martha Cooper is a documentary photographer who has specialized in urban vernacular art and architecture for more than twenty-five years. Cooper worked as a staff photographer for the New York Post from 1977 to 1980, when she left to follow the emerging hip hop scene. In 1984, collaborating with Henry Chalfant, she published Subway Art (Thames & Hudson), the classic book showcasing the best painted trains of the era, which has been dubbed "The Bible" by graffiti writers.