Since 2007, Joe Epstein, photographer, designer and author of LDNGraffiti.co.uk, has been casually observing and painstakingly charting the lifespan of London's most diverse graffiti and street art. An authoritative voice in the field, Joe has contributed to exhibitions in the UK, assisted Channel 4 to produce the documentary Graffiti Wars, collaborated on a four-part documentary series that was broadcast in South-East Asia and developed the Banksy London Tour iPhone app. London Graffiti and Street Art is his first book.LDNGraffiti.co.uk and @LDNGraffiti