Nicholas Ganz aka Keinom is a freelance photographer and author from Essen, Germany. He started to paint in the streets in 1994 and has been documenting graffiti and street art ever since. In 2004, he published his first book, Graffiti World, which became a world-wide best-seller and was translated into 11 languages. In 2006, he released Graffiti Women and went on to write several books about Burma/Myanmar. James Prigoff (born October 29, 1927) is an American photographer, author, and lecturer focusing on public murals, graffiti, and spraycan art. He has traveled extensively throughout the world documenting these art forms, and his personal archive of 80,000 slides may well be the most comprehensive of any individual mural and graffiti documentarian. Publications by James Prigoff include Spraycan Art (1987, Thames & Hudson)