Exclusive Episode #022: Mark Bradford painting Ridin' Dirty (2006) in his Los Angeles studio. Mark Bradford transforms materials scavenged from the street into wall-sized collages and installations that respond to the impromptu networks—underground economies, migrant communities, or popular appropriation of abandoned public space—that emerge within a city. Bradford's work is as informed by his personal background as a third-generation merchant in Los Angeles as it is by the tradition of abstract painting developed worldwide in the twentieth century. Learn more about Mark Bradford: http://www.art21.org/artists/mark-bradford VIDEO | Producer: Susan Sollins & Nick Ravich. Camera: Bob Elfstrom. Sound: Ray Day. Editor: Monte Matteotti. Artwork courtesy: Mark Bradford.