He has also donated thousands of his photographs to historic archives .
Over the years Prigoff has exhibited his photographs in many cities and has lectured around the world on the topic of public murals , graffiti , and spraycan art .
Prigoff has also donated thousands of Prigoff photographs photographs to historic archives .
Over the years Prigoff has exhibited his photographs in many cities and has lectured around the world on the topic of public murals , graffiti , and spraycan art .