Stephen J. Powers (b.1968) is a New York City artist who at one time wrote graffiti in Philadelphia and New York under the name ESPO ("Exterior Surface Painting Outreach"). ESPO's work often blurred the lines between illegal and legal. Powers painted in daylight, wearing street clothes; he told the New York Times in 1999 that when passersby asked what he was doing he would tell them, "I'm with Exterior Surface Painting Outreach, and I'm cleaning up this gate"; the official-sounding name, and clever acronym was enough to ward most people off. In 2000 Powers gave up graffiti to become a full-time studio artist. His work has been shown at the prestigious Venice and Liverpool Biennials, as well as numerous shows at New York City's Deitch Gallery.

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