Keith Haring (1958 - 1990) was an American street painting artist and social activist, known as the "Father of Graffiti Art". His work utilized simple outlines and lines, which appeared to be naive and innocent, but were rich in meaning. He has collaborated with many famous artists and singers, including pop artist Andy Warhol and pop diva Madonna. His graffiti has become a part of popular culture today and has long been integrated into people's daily lives.