From Wikipedia:

Banksy is a well-known pseudo-anonymous English graffiti artist. He is believed to be a native of Yate (near Bristol) and born in 1974, but there is substantial public uncertainty about his identity and personal and biographical details. According to Tristan Manco, Banksy "was born in 1974 and raised in Bristol, England. The son of a photocopier engineer, he trained as a butcher but became involved in graffiti during the great Bristol aerosol boom of the late 1980s." His artworks are often-satirical pieces of art that encompass topics such as politics, culture, and ethics. His street art, which combines graffiti with a distinctive stencilling technique, has appeared in London and in cities around the world.